OFFSET
0,5
FORMULA
a(n) = n! * [x^n] exp( Sum_{1 <= j <= sqrt(n)} x^j / j! ).
MATHEMATICA
Table[n! SeriesCoefficient[Exp[Sum[x^j/j!, {j, 1, Floor[Sqrt[n]]}]], {x, 0, n}], {n, 0, 25}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Dec 27 2023
STATUS
approved