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A117271
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Column 0 of triangle A117270, which is the matrix log of triangle A117269.
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3
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0, 1, 2, 12, 134, 2100, 42302, 1041852, 30331814, 1019056260, 38805685262, 1651676734092, 77703508288694, 4003868870257620, 224255353667365022, 13565588100060643932, 881405810330856632774, 61218510507062012550180
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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FORMULA
| E.g.f.: A(x) = log( (3-sqrt(5-4*exp(x)))/2 ).
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PROG
| (PARI) {a(n)=local(C=matrix(n+1, n+1, r, c, if(r>=c, binomial(r-1, c-1))), M=C, L); for(i=1, n+1, M=(M-M^0)^2+C); L=sum(r=1, #M, -(M^0-M)^r/r); return(L[n+1, 1])}
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CROSSREFS
| Cf. A117269, A117270.
Sequence in context: A179420 A080487 A077696 * A180353 A201561 A205886
Adjacent sequences: A117268 A117269 A117270 * A117272 A117273 A117274
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Mar 05 2006
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