OFFSET
0,2
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (0,4,0,-6,0,4,0,-1)
FORMULA
G.f.: (5*x^2+1) *(x^4+2*x^3+6*x^2+2*x+1) / ( (x-1)^4 *(1+x)^4 ).
a(2*n+1) = 2*A059722(n+1). - R. J. Mathar, Jan 28 2017
a(n) = ((3 + (-1)^n)*(1+n+n^2+n^3)) / 4. - Colin Barker, Feb 07 2017
MAPLE
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Jan 26 2017
STATUS
approved