A032162 Shifts left 2 places under "CGK" (necklace, element, unlabeled) transform.

1, 1, 1, 1, 2, 2, 4, 7, 11, 21, 36, 72, 131, 250, 479, 924, 1832, 3553, 7039, 13952, 27720, 55482, 111199, 223683, 451416, 912333, 1850179, 3758123, 7652318, 15609910, 31896318, 65290662, 133841148, 274787842, 564923951

Offset

1,5

Links

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

C. G. Bower, Transforms (2)

Prog

(PARI)
CGK(v)={apply(p->subst(serlaplace(p/y), y, 1), 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], CGK(v))); v} \\ Andrew Howroyd, Sep 20 2018

Crossrefs

Sequence in context: A277752 A095054 A316210 * A000983 A095325 A179183

Adjacent sequences: A032159 A032160 A032161 * A032163 A032164 A032165

Keyword

nonn

Author

Christian G. Bower

Status

approved