A089833 a(n) = A000108(n)*(A000142(n+1)-1).

0, 1, 10, 115, 1666, 30198, 665148, 17296851, 518916970, 17643220738, 670442556004, 28158587998814, 1295295050441588, 64764752531737100, 3497296636751245560, 202843204931717665155, 12576278705767060962330

Offset

0,3

Links

Table of n, a(n) for n=0..16.

Formula

a(n) = A001813(n) - A000108(n).

Prog

(MIT/GNU Scheme) (define (A089833 n) (* (A000108 n) (-1+ (A000142 (1+ n)))))

Crossrefs

The first column of A089831.

Cf. A000108, A001813, A089835.

Sequence in context: A138845 A079678 A233908 * A308667 A251318 A083448

Adjacent sequences: A089830 A089831 A089832 * A089834 A089835 A089836

Keyword

nonn

Author

Antti Karttunen, Dec 05 2003

Status

approved