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

1,2

Links

Table of n, a(n) for n=1..22.

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)

Crossrefs

Cf. A156933

Equals second column of A156925

Other columns A156935, A156936, A156937

Sequence in context: A034009 A038732 A038799 * A036684 A230905 A026640

Adjacent sequences: A156931 A156932 A156933 * A156935 A156936 A156937

Keyword

easy,nonn

Author

Johannes W. Meijer, Feb 20 2009

Status

approved