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A238431
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Expansion of F(x) where F(x) = 1 + x / (1 - x * F(x^2)^2 ).
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0
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1, 1, 1, 1, 3, 5, 10, 19, 36, 69, 135, 258, 500, 963, 1862, 3592, 6940, 13393, 25869, 49939, 96437, 186190, 359531, 694176, 1340393, 2588071, 4997263, 9648958, 18630886, 35973552, 69460077, 134117616, 258962680, 500020761, 965470897, 1864189893, 3599491983, 6950118531, 13419713384, 25911601377
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OFFSET
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0,5
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COMMENTS
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What does this sequence count?
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LINKS
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PROG
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(PARI)
N=66; R=O('x^N); x='x+R;
F = 1; for (k=1, N+1, F = 1 + x / (1 - x * subst(F, 'x, 'x^2)^2 ) + R; );
Vec(F)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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