G.f.: (1 + 3x) * Prod_{ n >= 1} (1 + x^(2^n-1) + 2*x^(2^n)).
1, 4, 5, 7, 6, 13, 16, 13, 6, 13, 17, 20, 25, 42, 44, 25, 6, 13, 17, 20, 25, 42, 45, 32, 25
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Wed May 20 23:43:57 CEST 2009 [seqfan] generating functions for toothpick sequences