A213439 A000136(n)/2. (Formerly N1106)

1, 3, 8, 25, 72, 231, 696, 2268, 7030, 23155, 73188, 242957, 778946, 2601345, 8430992, 28289598, 92470194, 311472985, 1025114180, 3463982109, 11465054942, 38846071490, 129180293184, 438697998100, 1464716085664, 4984101484479, 16698145444260, 56918978668875

Offset

2,2

References

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

Links

Table of n, a(n) for n=2..29.

Crossrefs

Cf. A000136, A000560.

Sequence in context: A093969 A259699 A259700 * A006177 A148788 A292778

Adjacent sequences: A213436 A213437 A213438 * A213440 A213441 A213442

Keyword

nonn

Author

N. J. A. Sloane, Jun 11 2012

Status

approved