A032222 "DGJ" (bracelet, element, labeled) transform of 2,2,2,2...

1, 2, 4, 14, 48, 162, 1186, 6918, 39696, 537170, 3056574, 25758438, 355775778, 3541870438, 26985605042, 248862069474, 6053773511696, 46393386523698, 511397173220686, 4891387087110678, 118913797103152638

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..200

C. G. Bower, Transforms (2)

Prog

(PARI) seq(n)=[subst(serlaplace(p/y + polcoeff(p, 1) + polcoeff(p, 2)), y, 1)/2 | p <- Vec(serlaplace(y-1+prod(k=1, n, 1 + x^k*y/k! + O(x*x^n))^2))] \\ Andrew Howroyd, Sep 11 2018

Crossrefs

Sequence in context: A152103 A102879 A032312 * A212268 A092665 A046650

Adjacent sequences: A032219 A032220 A032221 * A032223 A032224 A032225

Keyword

nonn

Author

Christian G. Bower

Extensions

a(0)=1 prepended by Andrew Howroyd, Sep 11 2018

Status

approved