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A218032
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G.f. A(x) satisfies A(x) = 1 + x / (1 - x * A(x^2)).
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3
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1, 1, 1, 1, 2, 3, 5, 8, 13, 21, 35, 57, 94, 154, 254, 417, 687, 1129, 1859, 3057, 5032, 8277, 13623, 22412, 36883, 60684, 99862, 164312, 270384, 444899, 732093, 1204629, 1982228, 3261701, 5367131, 8831505, 14532200, 23912499, 39347839, 64746320, 106539481, 175309363, 288469809
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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 + x;
for (k=1, N+1, F = 1 + x / (1 - x * subst(F, 'x, 'x^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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