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Search: id:A087959
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| A087959 |
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G.f. satisfies A(x) = 1 + xA(xA(xA(x))). |
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+0
1
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| 1, 1, 1, 2, 6, 22, 95, 463, 2483, 14426, 89799, 594038, 4150514, 30482791, 234428282, 1881944298, 15729230166, 136566166388, 1229346044429, 11454129882773, 110293243452027, 1096078120808889
(list; graph; listen)
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OFFSET
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0,4
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MAPLE
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A:= proc(n) option remember; local T; if n=0 then 1 else T:= A(n-1); unapply (convert (series (1+ x*T (x*T (x*T(x))), x, n+1), polynom), x) fi end: a:= n-> coeff (A(n)(x), x, n): seq (a(n), n=0..21); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Aug 23 2008]
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CROSSREFS
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Cf. A087949.
Sequence in context: A001861 A049526 A093793 this_sequence A006871 A130907 A054096
Adjacent sequences: A087956 A087957 A087958 this_sequence A087960 A087961 A087962
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Sep 16 2003
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