A082428 a(1)=1, a(n)=n*(a(n-1)+a(n-2)+...+a(2)+a(1)) + 3.

1, 5, 21, 111, 693, 4989, 40743, 372507, 3771633, 41907033, 507075099, 6638074023, 93486209157, 1409484384213, 22652427603423, 386601431098419, 6982988349215193, 133087542655630737, 2669144605482372003

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Formula

for n>=2 a(n) = ceiling(n*(3e-7)*n!)

Crossrefs

Cf. A007808, A074143.

Sequence in context: A218299 A121881 A041321 * A015558 A168598 A002711

Adjacent sequences: A082425 A082426 A082427 * A082429 A082430 A082431

Keyword

nonn

Author

Benoit Cloitre, Apr 24 2003

Status

approved