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Search: id:A136752
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| A136752 |
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G.f.: A(x) = x/(1-x) o x/(1-x^2) o x/(1-x^4) o x/(1-x^8) o..., composition of functions x/(1 - x^{2^n}) for n=0,1,2,3,... |
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4
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| 1, 1, 2, 3, 6, 10, 19, 33, 61, 108, 198, 354, 645, 1159, 2106, 3795, 6874, 12405, 22457, 40560, 73374, 132578, 239782, 433362, 783602, 1416401, 2560953, 4629393, 8369741, 15130440, 27354520, 49451349, 89401972, 161622356, 292191262
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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The composition transpose of A136753.
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EXAMPLE
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G.f.: A(x) is the limit of composition of functions x/(1-x^{2^n}):
F_0(x) = x/(1-x)
F_1(x) = F_1(x/(1-x^2)) = x + x^2 + 2x^3 + 3x^4 + 5x^5 + 8*x^6 + 13x^7 +...
F_2(x) = F_2(x/(1-x^4)) = x + x^2 + 2x^3 + 3x^4 + 6x^5 + 10x^6 + 19x^7 +...
F_3(x) = x/(1-x) o x/(1-x^2) o x/(1-x^4) o x/(1-x^8) =
x + x^2 + 2x^3 + 3x^4 + 6x^5 + 10x^6 + 19x^7 + 33x^8 + 61x^9 + 108x^10 +...
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PROGRAM
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(PARI) {a(n)=local(A=x+x*O(x^n)); if(n<=0, 0, m=#binary(n+1); for(i=1, m, A=A/(1-A^(2^(m-i)))); polcoeff(A, n))}
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CROSSREFS
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Cf. A136753; variants: A136750, A136751, A119470, A119471.
Adjacent sequences: A136749 A136750 A136751 this_sequence A136753 A136754 A136755
Sequence in context: A014595 A079959 A028495 this_sequence A093126 A003237 A026021
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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), Jan 21 2008
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