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Search: id:A054114
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| 1, 8, 28, 98, 350, 1274, 4706, 17576, 66196, 250952, 956384, 3660540, 14061140, 54177740, 209295260, 810375650, 3143981870, 12219117170, 47564380970, 185410909790, 723668784230, 2827767747950, 11061198475550, 0, 0, 0
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OFFSET
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0,2
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COMMENT
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Apart from the initial term, identical to A066796.
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FORMULA
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G.f.: [ -1+3x+5x^2-4x^3+sqrt(1-4x)]/[(1-x)(1-4x)]. - R. Stephan, Apr 03 2004
For n>0, a(n) = sum(k=1, n+1, C(2k, k)). - R. Stephan, Apr 03 2004
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CROSSREFS
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Sequence in context: A130129 A005343 A095857 this_sequence A110687 A054857 A110046
Adjacent sequences: A054111 A054112 A054113 this_sequence A054115 A054116 A054117
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
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Corrected by Franklin T. Adams-Watters, Oct 25 2006
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