A178961 Partial sums of A001010.

1, 3, 5, 9, 15, 23, 41, 61, 117, 165, 343, 475, 1049, 1397, 3267, 4275, 10419, 13231, 33545, 41965, 109499, 133895, 359367, 434123, 1189795, 1412351, 3952757, 4646449, 13211071, 15318819, 44260077, 50916453, 148927917, 169476849

Offset: 1

Author

Jonathan Vos Post, Dec 31 2010

Keywords

• nonn
• changed

Comments

Number of symmetric foldings of a strip of <= n stamps.

Examples

			a(13) = 1 + 2 + 2 + 4 + 6 + 8 + 18 + 20 + 56 + 48 + 178 + 132 + 574 = 1049 is prime.
		

Links

• Hunter Hogan, Table of n, a(n) for n = 1..52
• Index entries for sequences obtained by enumerating foldings

Crossrefs

Cf. A001010.

Formula

a(n) = Sum_{i=1..n} A001010(i).