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A032320 Doubles (index 2+) under "EGJ" (unordered, element, labeled) transform. 1
2, 2, 12, 126, 1800, 33540, 757680, 20149290, 616940520, 21378058800, 827126546400, 35346832387020, 1653593623521840, 84055016334088800, 4613207941230688800, 271883701342581277950, 17125855412989960236600, 1148187688612239672677280, 81635218693106948988998880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

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

C. G. Bower, Transforms (2)

PROG

(PARI) EGJ(v)={Vec(serlaplace(prod(k=1, #v, (1 + x^k/k! + O(x*x^#v))^v[k]))-1, -#v)}

seq(n)={my(v=[2]); for(i=2, n, v=concat(v, EGJ(concat(v, [0]))[i])); v} \\ Andrew Howroyd, Sep 21 2018

(PARI) seq(n)={my(p=(1+x)^2 + O(x*x^n)); for(k=2, n, p*=(1 + x^k/k! + O(x*x^n))^(k!*polcoef(p, k))); Vec(x+serlaplace(p-1)/2)} \\ Andrew Howroyd, Sep 21 2018

CROSSREFS

Sequence in context: A013311 A303343 A087220 * A032227 A032069 A003090

Adjacent sequences:  A032317 A032318 A032319 * A032321 A032322 A032323

KEYWORD

nonn

AUTHOR

Christian G. Bower

EXTENSIONS

Terms a(17) and beyond from Andrew Howroyd, Sep 21 2018

STATUS

approved

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Last modified October 17 19:36 EDT 2018. Contains 316293 sequences. (Running on oeis4.)