A089833 - OEIS

%I #9 May 18 2024 14:52:03

%S 0,1,10,115,1666,30198,665148,17296851,518916970,17643220738,

%T 670442556004,28158587998814,1295295050441588,64764752531737100,

%U 3497296636751245560,202843204931717665155,12576278705767060962330

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

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

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

%Y The first column of A089831.

%Y Cf. A000108, A001813, A089835.

%K nonn

%O 0,3

%A _Antti Karttunen_, Dec 05 2003