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A291091
a(n) = A214938(2n+1).
3
1, 2, 7, 28, 122, 562, 2693, 13288, 67064, 344588, 1796518, 9479780, 50532640, 271710662, 1471935235, 8026070768, 44015873308, 242619318848, 1343427572648, 7469219870968, 41680871386016, 233373274580372, 1310659959443722, 7381448319246248, 41678055955034962
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A150661 A269228 A005435 * A380681 A215973 A143927
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 19 2017
EXTENSIONS
a(17)-a(24) from Lars Blomberg, Aug 20 2017
STATUS
approved