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A291088 a(n) = A026520(2n). 3
1, 2, 8, 38, 196, 1052, 5774, 32146, 180772, 1024256, 5837908, 33433996, 192239854, 1109049320, 6416509142, 37215072638, 216309089956, 1259663964184, 7347943049432, 42926944354480, 251119894730596, 1470830479288432, 8624336421678788, 50620679934081988 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Lars Blomberg, Table of n, a(n) for n = 0..500

CROSSREFS

Cf. A026520, A291089.

Sequence in context: A059423 A112109 A026939 * A047098 A271934 A266797

Adjacent sequences:  A291085 A291086 A291087 * A291089 A291090 A291091

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 19 2017

EXTENSIONS

a(15)-a(23) from Lars Blomberg, Sep 01 2017

STATUS

approved

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Last modified November 20 13:03 EST 2019. Contains 329336 sequences. (Running on oeis4.)