|
|
A371312
|
|
Expansion of e.g.f. Product_{k>=1} 1 / (1 - x^k/k!)^2.
|
|
1
|
|
|
1, 2, 8, 38, 228, 1562, 12386, 109286, 1073988, 11545994, 135393438, 1714890806, 23380747506, 341014477390, 5303722839850, 87582446980418, 1531259993710468, 28254163132485930, 548854481037814382, 11196310379931318758, 239346426732701009838, 5350768890908294837294
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
COMMENTS
|
Exponential self-convolution of A005651.
|
|
LINKS
|
|
|
FORMULA
|
|
|
MATHEMATICA
|
nmax = 21; CoefficientList[Series[Product[1/(1 - x^k/k!)^2, {k, 1, nmax}], {x, 0, nmax}], x] Range[0, nmax]!
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|