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

1,2

Comments

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

Links

Hunter Hogan, Table of n, a(n) for n = 1..52

Index entries for sequences obtained by enumerating foldings

Formula

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

Example

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

Crossrefs

Cf. A001010.

Sequence in context: A033498 A384544 A147493 * A147509 A057259 A045599

Adjacent sequences: A178958 A178959 A178960 * A178962 A178963 A178964

Keyword

nonn

Author

Jonathan Vos Post, Dec 31 2010

Status

approved