A061173 One-fourth of fourth column of Lucas bisection triangle (odd part).

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.

Links

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

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

Cf. A005248, 2*A061171, A061172.

Sequence in context: A132793 A305086 A316737 * A156598 A082942 A000282

Adjacent sequences: A061170 A061171 A061172 * A061174 A061175 A061176

Keyword

nonn,easy

Author

Wolfdieter Lang, Apr 20 2001

Status

approved