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A271908
a(n) = A186434(n)/4.
3
0, 1, 9, 37, 111, 266, 550, 1006, 1744, 2821, 4349, 6405, 9203, 12804, 17418, 23164, 30348, 39023, 49591, 62073, 76997, 94454, 114768, 138054, 165176, 196019, 231085, 270557, 315283, 365102, 421116, 482950, 552092, 628401, 712437, 804509, 906217, 1016724, 1137140, 1267836, 1410790, 1564903
OFFSET
1,3
COMMENTS
It would be nice to have a formula.
LINKS
CROSSREFS
Cf. A186434.
Sequence in context: A288116 A165394 A213570 * A257448 A288415 A026620
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 22 2016
STATUS
approved