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 A217716 Duplicate of A129824. 4
 2, 4, 12, 64, 700, 17424, 1053696, 160579584, 62856336636, 63812936890000, 168895157342195152, 1169048914836855865344, 21209591746609937928524800, 1010490883477487017627972550656, 126641164340871500483202065902080000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Number of words less than or equal to the concatenation of the n-th row of Pascal's Triangle. a(n) = 2 * A055612(n). - Reinhard Zumkeller, Jan 31 2015 Same as A129824. - Georg Fischer, Oct 14 2018 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..69 FORMULA a(n) = Product_{k=0..n} (binomial(n,k) + 1). EXAMPLE Row 2 is 1 2 1 and we have 000, 001, 010, 011, 020, 021, 100, 101, 110, 111, 120 and 121 so a(2)=12. MATHEMATICA Table[Product[Binomial[n, k] + 1, {k, 0, n}], {n, 0, 15}] (* T. D. Noe, Mar 21 2013 *) CROSSREFS Sequence in context: A005831 A136512 A137160 * A129824 A266463 A013207 Adjacent sequences:  A217713 A217714 A217715 * A217717 A217718 A217719 KEYWORD dead AUTHOR Jon Perry, Mar 21 2013 STATUS approved

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Last modified January 25 04:27 EST 2021. Contains 340416 sequences. (Running on oeis4.)