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qid 10372 · computer science

Question: How many trees are there on 5 unlabeled vertices?

  1. 3
  2. 6
  3. 8
  4. 10
  5. 11
  6. 12
  7. 15
  8. 9
  9. 7
  10. 5

Our answer: A. 3 Source quote machine-checked (exact quote)

A machine check confirms the quoted words appear at the source. A person has not yet reviewed these. EARN MARKS as a Human Reviewer

How it was answered

Stored method, replayed by code (kind: formula)

card: formula · card sha256 a8bc263b1fc5a83f…

Current source

OEIS A000055, Number of trees with n unlabeled nodes

https://oeis.org/A000055

“Number of trees with n unlabeled nodes. (Formerly M0791 N0299)”

Source quote machine-checked (exact quote)

retrieved 2026-09-18T00:09:52.626Z

page text sha256 428e5226cb4eb7d1… · content sha256 312eba8f83e43aa0…

addendum formula_qid10372.formula_ADDENDUM_source_rs20260918T000952Z · sha256 c022a66272ed1e63… · replaces the version below, addendum sha256 046c07238e1a55cd…

Earlier version (superseded)

No public source has been found for this card yet (2 places checked internally).

addendum formula_qid10372.formula_ADDENDUM_source · sha256 046c07238e1a55cd…

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