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A187894
Numerators of expansion of sqrt(F-1) where F is the g.f. for A000957.
0
0, 1, 1, 5, 13, 151, 463, 2957, 9725, 261739, 896507, 6231571, 21920539, 311583955, 1116869179, 8066939069, 29323723037, 1715310801971, 6303146700755, 46534580965463, 172479371522639, 2566609537700489, 9580228898547889, 71737644622567835, 269340391562396747, 8110742483462690623, 30602551916179033519
OFFSET
0,4
COMMENTS
The denominators are powers of 2.
REFERENCES
L. W. Shapiro and C. J. Wang, Generating identities via 2 X 2 matrices, Congressus Numerantium, 205 (2010), 33-46.
EXAMPLE
0, 1, 1, 5/2, 13/2, 151/8, 463/8, 2957/16, 9725/16, 261739/128, 896507/128, ...
CROSSREFS
Cf. A000957.
Sequence in context: A099974 A247820 A336097 * A214591 A159261 A117077
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Mar 15 2011
STATUS
approved