A026128 a(n) = T(2n,n), where T is the array in A026120.

1, 1, 7, 35, 188, 1029, 5730, 32292, 183660, 1052062, 6061247, 35085362, 203888951, 1188784325, 6951007260, 40743883935, 239338600713, 1408601096922, 8304165939530, 49029683529190, 289875333579403, 1715915953729017, 10168679421464922, 60321828267447075, 358169629787960445

Offset

0,3

Links

Table of n, a(n) for n=0..24.

Crossrefs

Bisection of A026133. Cf. A026120.

Sequence in context: A289991 A295248 A295647 * A026157 A025184 A360083

Adjacent sequences: A026125 A026126 A026127 * A026129 A026130 A026131

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Sep 17 2019

Status

approved