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A026689 a(n) = T(n,0) + T(n,1) + ... + T(n,[ n/2 ]), T given by A026681. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

CROSSREFS

Sequence in context: A120391 A064217 A026623 * A138276 A287682 A209236

Adjacent sequences:  A026686 A026687 A026688 * A026690 A026691 A026692

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified January 17 09:54 EST 2020. Contains 330949 sequences. (Running on oeis4.)