A026689 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026681.

1, 1, 4, 6, 18, 27, 82, 138, 390, 644, 1837, 3242, 8835, 15271, 42086, 76403, 203377, 361636, 974089, 1802727, 4718991, 8559441, 22673687, 42562209, 110006420, 202537249, 529643894, 1005279834, 2572145945, 4791823354

Offset

0,3

Links

Table of n, a(n) for n=0..29.

Crossrefs

Sequence in context: A120391 A064217 A026623 * A390043 A138276 A287682

Adjacent sequences: A026686 A026687 A026688 * A026690 A026691 A026692

Keyword

nonn

Author

Clark Kimberling

Status

approved