A111686 (n+1) + (n+1)(n+2) + ..., with n terms.

2, 15, 144, 1925, 33648, 726327, 18636560, 553680369, 18684924840, 705833193923, 29502690532392, 1351724235304365, 67359683340291104, 3627011494019437935, 209846445862386234528, 12982402818188717219657, 855210841645834409812920

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..365

Eric Weisstein's World of Mathematics, Rising Factorial.

Example

a(3) = 4+ 4*5 +4*5*6 = 144.

Maple

a:=n->sum((n+j)!, j=1..n)/n!: seq(a(n), n=1..18); # Emeric Deutsch, Aug 27 2005

Crossrefs

Cf. A111685, A054654.

Sequence in context: A224885 A371575 A253571 * A371582 A001854 A060226

Adjacent sequences: A111683 A111684 A111685 * A111687 A111688 A111689

Keyword

nonn,changed

Author

Amarnath Murthy, Aug 16 2005

Extensions

a(6)-a(10) from Jonathan Vos Post Aug 17 2005

More terms from Emeric Deutsch, Aug 27 2005

Status

approved