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A067336
a(0)=1, a(1)=2, a(n)=a(n-1)*9/2-Catalan(n-1) where Catalan(n)=C(2n,n)/(n+1)=
A000108
(n).
+0
8
1, 2, 8, 34, 148, 652, 2892, 12882, 57540, 257500, 1153888, 5175700, 23231864, 104335376, 468766292, 2106773874, 9470787588, 42583186476, 191494694352, 861248485884, 3873850923288, 17425765034376, 78391476387672
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.
AT&T Labs Research
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