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 A032307 Shifts left 2 places under "EFK" (unordered, size, unlabeled) transform. 1
 1, 1, 1, 1, 2, 2, 4, 6, 10, 17, 29, 50, 88, 156, 279, 498, 909, 1639, 3010, 5495, 10152, 18674, 34745, 64312, 120197, 223850, 420057, 785683, 1480429, 2779462, 5253203, 9899964, 18761327, 35461501, 67383407, 127689713 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..500 PROG (PARI) EFK(p, n)={prod(k=1, n, 1 + polcoef(p, k)*x^k + O(x*x^n))} seq(n)={my(p=O(1)); for(i=0, (n-1)\2, p=1+x*EFK(x*p, 2*i)); Vec(p+O(x^n))} \\ Andrew Howroyd, Sep 20 2018 CROSSREFS Sequence in context: A060553 A293673 A293505 * A007560 A032237 A276061 Adjacent sequences:  A032304 A032305 A032306 * A032308 A032309 A032310 KEYWORD nonn AUTHOR STATUS approved

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Last modified October 21 06:39 EDT 2019. Contains 328292 sequences. (Running on oeis4.)