A112001 One fourth of fourth column (k=3) of triangle A111999.

6, -231, 6608, -176330, 4714710, -130014885, 3745101360, -113311778580, 3608430175350, -120977128347075, 4267052705916000, -158151857368254750, 6150573832264611750, -250598489767931930625, 10680148143520635780000, -475373543975596731465000

Offset

0,1

Links

Table of n, a(n) for n=0..15.

Formula

a(n)=A112492(n+4, 3)/4, n>=0.

Conjecture: +n*(20*n^2+75*n+67)*a(n) +(2*n+5)*(n+2)*(20*n^2+115*n+162)*a(n-1)=0. - R. J. Mathar, Jul 09 2017

Crossrefs

Sequence in context: A177043 A309009 A117064 * A286314 A099124 A172862

Adjacent sequences: A111998 A111999 A112000 * A112002 A112003 A112004

Keyword

sign,easy

Author

Wolfdieter Lang, Sep 12 2005

Status

approved