A026157 a(n) = T(2n,n), where T is the array in A026148.

1, 1, 7, 35, 189, 1038, 5796, 32734, 186494, 1069793, 6170554, 35752906, 207940493, 1213271620, 7098581115, 41631465591, 244669507994, 1440588095878, 8495970243502, 50179297862166, 296763850899633

Offset

0,3

Links

Table of n, a(n) for n=0..20.

Crossrefs

Sequence in context: A295248 A295647 A026128 * A025184 A360083 A267712

Adjacent sequences: A026154 A026155 A026156 * A026158 A026159 A026160

Keyword

nonn

Author

Clark Kimberling

Status

approved