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A156934
G.f. of the z^1 coefficients of the FP2 in the second column of the A156925 matrix
4
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
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
Equals second column of A156925
Other columns A156935, A156936, A156937
Sequence in context: A034009 A038732 A038799 * A036684 A230905 A026640
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Feb 20 2009
STATUS
approved