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Search: id:A067299
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| 2, 5, 32, 284, 2960, 33872, 411776, 5221568, 68299520, 914858240, 12486496256, 173031701504, 2428066058240, 34432752275456, 492697174507520, 7104716644990976, 103142445617709056, 1506248913346691072
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OFFSET
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0,1
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FORMULA
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a(n)=A067298(n+1, 1).
G.f.: ((1+x)*c(2, 2; x)-1)/x, with c(2, 2; x) := (1-3*x*c(4*x))/(1-2*x*c(4*x))^2 g.f. for A064340 and c(x) is g.f. for A000108 (Catalan).
G.f.: (2+x + 12*x*(1+x)*c(4*x))/(1+2*x)^2, where c(x) is g.f. for A000108 (Catalan). (W. Lang, May 05 2006).
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CROSSREFS
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Cf. A064340 (first column), A067300 (third column).
Sequence in context: A009274 A019036 A005636 this_sequence A118325 A019037 A019038
Adjacent sequences: A067296 A067297 A067298 this_sequence A067300 A067301 A067302
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KEYWORD
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nonn,easy
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AUTHOR
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Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 05 2002
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