A217716 Duplicate of A129824.

2, 4, 12, 64, 700, 17424, 1053696, 160579584, 62856336636, 63812936890000, 168895157342195152, 1169048914836855865344, 21209591746609937928524800, 1010490883477487017627972550656, 126641164340871500483202065902080000

Offset: 0

Author

Jon Perry, Mar 21 2013

Keywords

• dead

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

Examples

			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.
		

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 0..69

Programs

Mathematica

Table[Product[Binomial[n, k] + 1, {k, 0, n}], {n, 0, 15}] (* T. D. Noe, Mar 21 2013 *)

Formula

a(n) = Product_{k=0..n} (binomial(n,k) + 1).