OFFSET
-1,2
COMMENTS
Middle function 5th down in the triangle A155120.
LINKS
G. C. Greubel, Table of n, a(n) for n = -1..1000
Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
FORMULA
a(n) = 16 + 80*n + 140*n^2 + 100*n^3 + 24*n^4.
G.f.: 8*(2 +35*x +35*x^2)/(1-x)^5.
E.g.f.: 4*(4 + 86*x + 152*x^2 + 61*x^3 + 6*x^4)*exp(x). - G. C. Greubel, Mar 25 2021
MAPLE
seq( 4*(3*n+2)*(2*n+1)*(n+2)*(n+1), n=-1..30); # G. C. Greubel, Mar 25 2021
MATHEMATICA
Table[16 +80*n +140*n^2 +100*n^3 +24*n^4, {n, -1, 30}]
PROG
(Magma) [4*(3*n+2)*(2*n+1)*(n+2)*(n+1): n in [-1..30]]; // G. C. Greubel, Mar 25 2021
(Sage) [4*(3*n+2)*(2*n+1)*(n+2)*(n+1) for n in (-1..30)] # G. C. Greubel, Mar 25 2021
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Roger L. Bagula, Jan 20 2009
EXTENSIONS
Edited by the Associate Editors of the OEIS, Nov 08 2009, Dec 15 2010
STATUS
approved