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A084603
Coefficients of 1/(1-2x-11x^2)^(1/2); also, a(n) is the central coefficient of (1+x+3x^2)^n.
+0
7
1, 1, 7, 19, 91, 331, 1441, 5797, 24739, 103411, 441397, 1876777, 8047909, 34533253, 148803487, 642228139, 2778852979, 12043194163, 52286516821, 227323871929, 989675651041, 4313712072241, 18822940658947, 82215245701519
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.
AT&T Labs Research
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