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A061173
One-fourth of fourth column of Lucas bisection triangle (odd part).
3
3, 70, 642, 4055, 20945, 95372, 398290, 1561683, 5836190, 21001410, 73300478, 249476600, 831342517, 2720979140, 8768966810, 27881856697, 87610794135, 272424413508, 839229287580, 2563768831145, 7773145679478
OFFSET
0,1
COMMENTS
Numerator of g.f. is row polynomial sum(A061187(3,m)*x^m,m=0..5)/4.
FORMULA
a(n)=A060924(n+3, 3)/4.
G.f.: (x+1)*(3-2*x)*(1+11*x-11*x^2+4*x^3)/(1-3*x+x^2)^4.
CROSSREFS
Sequence in context: A132793 A305086 A316737 * A156598 A082942 A000282
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Apr 20 2001
STATUS
approved