A192925 Coefficient of x in the reduction by (x^2->x+1) of the polynomial p(n,x) defined below at Comments.

0, 1, 3, 11, 51, 281, 1808, 13333, 111041, 1031758, 10588015, 118985914, 1453708722, 19189390169, 272212629009, 4130239145929, 66751752077187, 1144920631189237, 20772556460037154, 397492611715916267, 8000930139415926955

Offset

0,3

Comments

The titular polynomial is defined by p(n,x)=n*p(n-1,x)+(x^2)*p(n-2,x), with p(0,x)=1, p(1,x)=x. For discussions of polynomial reduction, see A192232, A192744, and A192872.

Links

Table of n, a(n) for n=0..20.

Mathematica

(See A192924.)

Crossrefs

Cf. A192232, A192744, A192924.

Sequence in context: A127784 A112696 A346967 * A350354 A132006 A367011

Adjacent sequences: A192922 A192923 A192924 * A192926 A192927 A192928

Keyword

nonn

Author

Clark Kimberling, Jul 12 2011

Status

approved