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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 October 18 11:56 EDT 2018. Contains 316321 sequences. (Running on oeis4.)