A027173 a(n) = A027170(2n, n-1).

5, 30, 123, 472, 1790, 6794, 25879, 98952, 379674, 1461248, 5638930, 21811540, 84542016, 328287506, 1276868111, 4973645576, 19398954626, 75753497816, 296142817406, 1158865623236, 4539024407576, 17793358627976, 69805770185498

Offset

1,1

Links

Table of n, a(n) for n=1..23.

Crossrefs

Sequence in context: A359975 A047661 A000649 * A286973 A196452 A227267

Adjacent sequences: A027170 A027171 A027172 * A027174 A027175 A027176

Keyword

nonn

Author

Clark Kimberling

Status

approved