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A032067 Shifts left 2 places under "BGK" (reversible, element, unlabeled) transform. 1
1, 1, 1, 1, 2, 2, 4, 8, 12, 25, 43, 94, 177, 350, 702, 1413, 2954, 5963, 12333, 25625, 53069, 111201, 232727, 489177, 1032483, 2178467, 4617781, 9797643, 20844394, 44427033, 94824892, 202789246, 434245483, 931328024 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

C. G. Bower, Transforms (2)

PROG

(PARI)

BGK(v)={apply(p->subst(serlaplace(y^0*p + polcoeff(p, 1)), y, 1)/2, Vec(prod(k=1, #v, (1 + x^k*y + O(x*x^#v))^v[k])-1, -#v))}

seq(n)={my(v=vector(2-n%2, i, 1)); for(i=1, (n-1)\2, v=concat([1, 1], BGK(v))); v} \\ Andrew Howroyd, Sep 20 2018

CROSSREFS

Sequence in context: A048114 A268691 A102456 * A153996 A123024 A079092

Adjacent sequences:  A032064 A032065 A032066 * A032068 A032069 A032070

KEYWORD

nonn

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified October 19 14:21 EDT 2018. Contains 316362 sequences. (Running on oeis4.)