A080523 a(n) = n^n - n(n-1)/2.

1, 3, 24, 250, 3115, 46641, 823522, 16777188, 387420453, 9999999955, 285311670556, 8916100448190, 302875106592175, 11112006825557925, 437893890380859270, 18446744073709551496, 827240261886336764041

Offset

1,2

Links

Table of n, a(n) for n=1..17.

Mathematica

Table[n^n - n (n - 1)/2, {n, 20}]

Crossrefs

Sequence in context: A365154 A361846 A365147 * A203423 A319754 A218301

Adjacent sequences: A080520 A080521 A080522 * A080524 A080525 A080526

Keyword

nonn

Author

Amarnath Murthy, Mar 21 2003

Extensions

More terms from Harvey P. Dale, Mar 22 2003

Status

approved