A227313 Sum of squared terms in rows of triangle A227311.

4, 16, 64, 320, 1424, 6400, 28928, 131328, 599428, 2746176, 12627520, 58237952, 269284240, 1247921152, 5794490624, 26952340480, 125559053904, 585733448080, 2735853906496, 12793091964160, 59883014554112, 280568427766016, 1315670787139840, 6174463935221760, 28998036439469524, 136279914514165568, 640867368366269056

Offset: 1

Author

Paul D. Hanna, Jul 06 2013

Keywords

• nonn

Examples

			L.g.f.: L(x) = 4*x + 16*x^2/2 + 64*x^3/3 + 320*x^4/4 + 1424*x^5/5 + 6400*x^6/6 +...
where
exp(L(x)) = 1 + 4*x + 16*x^2 + 64*x^3 + 272*x^4 + 1168*x^5 + 5056*x^6 + 22016*x^7 +...
		

Crossrefs

Cf. A227311.

Programs

PARI

{A227311(n,k)=n*polcoeff(polcoeff(log(1 + 2*sum(m=1,sqrtint(n),y^m*x^(m^2))+x*O(x^n)),n,x),k,y)}
{a(n)=sum(k=1,n,A227311(n,k)^2)}
for(n=1, 36, print1(a(n), ", "))