A026151 a(n) = T(n,n), where T is the array in A026148.

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

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