A026112 a(n) = T(2n,n), where T is the array defined in A026105.

1, 1, 6, 30, 160, 873, 4851, 27300, 155115, 887910, 5112767, 29582886, 171857127, 1001762125, 5856231825, 34320863160, 201579530004, 1186231850298, 6992515244280, 41281814341780, 244049819182260, 1444558452300909, 8560106124666867, 50777065370076660

Offset

0,3

Links

Table of n, a(n) for n=0..23.

Crossrefs

Bisection of A026117.

Sequence in context: A238769 A280474 A208790 * A038155 A026331 A135490

Adjacent sequences: A026109 A026110 A026111 * A026113 A026114 A026115

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Alois P. Heinz, Sep 16 2019

Status

approved