OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..10000
Index entries for linear recurrences with constant coefficients, signature (5,-10,10,-5,1).
FORMULA
a(n) = Sum{j=0..n} C(4,2j)*C(n,2j).
MATHEMATICA
LinearRecurrence[{5, -10, 10, -5, 1}, {1, 1, 7, 19, 38}, 41] (* James C. McMahon, Sep 15 2024 *)
PROG
(PARI) N=66; x='x+O('x^N); Vec((1-4*x+12*x^2-16*x^3+8*x^4)/(1-x)^5) \\ Seiichi Manyama, Mar 11 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, May 14 2006
STATUS
approved