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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
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A112109 A345178 A026939 * A047098 A271934 A364723
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 19 2017
EXTENSIONS
a(15)-a(23) from Lars Blomberg, Sep 01 2017
STATUS
approved