A104508 - cp's OEIS frontend

A104508 Absolute row sums of triangle A104505, which is equal to the right-hand side of the triangle A084610 of coefficients in (1+x-x^2)^n.

%I A104508 #4 Mar 30 2012 18:36:45
%S A104508 1,2,4,9,20,47,103,198,512,1161,1985,5590,13005,21684,59294,142273,
%T A104508 270858,634187,1526399,3256372,6779657,16020364,37758202,79702477,
%U A104508 164647757,424655100,940639154,1709638551,4675803604,10774789429
%N A104508 Absolute row sums of triangle A104505, which is equal to the right-hand side of the triangle A084610 of coefficients in (1+x-x^2)^n.
%o A104508 (PARI) a(n)=sum(k=0,n,abs(polcoeff((1+x-x^2)^n,n+k)))
%Y A104508 Cf. A104505.
%K A104508 nonn
%O A104508 0,2
%A A104508 _Paul D. Hanna_, Mar 11 2005

cp's OEIS Frontend

A104508 Absolute row sums of triangle A104505, which is equal to the right-hand side of the triangle A084610 of coefficients in (1+x-x^2)^n.