A156934 G.f. of the z^1 coefficients of the FP2 in the second column of the A156925 matrix.

1, 8, 38, 144, 487, 1552, 4796, 14592, 44061, 132568, 398210, 1195280, 3586659, 10760992, 32284216, 96854144, 290564217, 871694760, 2615086750, 7845263120, 23535792671, 70607381808

Offset: 1

Author

Johannes W. Meijer, Feb 20 2009

Keywords

• easy
• nonn

Crossrefs

Cf. A156933

Equals second column of A156925

Other columns A156935, A156936, A156937

Formula

a(n)=6*a(n-1)-12*a(n-2)+10*a(n-3)-3*a(n-4)+2

a(n)=7*a(n-1)-18*a(n-2)+22*a(n-3)-13*a(n-4)+3*a(n-5)

a(n):= -1/6*n^3-n^2-7/3*n-9/4+9/4*3^n

G.f.: GF4(z;m=1) = z*(1+z)/((1-3*z)*(1-z)^4)