A025191 a(n) = Sum_{k=0..n} T(n,k), where T is the array defined in A025177.

1, 1, 4, 11, 33, 97, 288, 855, 2544, 7577, 22590, 67399, 201215, 601017, 1795966, 5368659, 16053417, 48015873, 143649102, 429842511, 1286452725, 3850770081, 11528245602, 34517105907, 103360732956, 309543786441, 927106804368, 2776994293355

Offset

0,3

Comments

Conjectures: a(n) = A027914(n)-A027914(n-1) = (A081673(n)-A081673(n-1))/2.

Links

Table of n, a(n) for n=0..27.

Crossrefs

Sequence in context: A143787 A289973 A236583 * A282990 A099159 A116394

Adjacent sequences: A025188 A025189 A025190 * A025192 A025193 A025194

Keyword

nonn

Author

Clark Kimberling

Extensions

a(1) corrected by Jason Yuen, Aug 05 2024

Status

approved