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A026151 a(n) = T(n,n), where T is the array in A026148. 0
1, 1, 2, 4, 12, 32, 89, 246, 685, 1912, 5355, 15038, 42339, 119484, 337935, 957738, 2719539, 7736208, 22044444, 62916696, 179841270, 514793944, 1475586687, 4234989242, 12169352003, 35009302296, 100826681530, 290683486132, 838873595124 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..28.

CROSSREFS

Cf. A026148

First differences of A026325 for n > 1.

Sequence in context: A293007 A028860 A152035 * A025178 A231295 A087211

Adjacent sequences:  A026148 A026149 A026150 * A026152 A026153 A026154

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

a(0)-a(1) inserted and a(20) corrected by Sean A. Irvine, Sep 18 2019

STATUS

approved

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Last modified August 8 11:31 EDT 2020. Contains 336298 sequences. (Running on oeis4.)