OFFSET
0,2
REFERENCES
Mark Thomas, Email to N. J. A. Sloane, Mar 03 2017
LINKS
Colin Barker, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (1,2,-2,-1,1).
FORMULA
From Colin Barker, Mar 04 2017: (Start)
a(n) = (n^2 + 14*n) / 8 for n>1 and even.
a(n) = (n^2 + 12*n - 5) / 8 for n>1 and odd.
a(n) = a(n-1) + 2*a(n-2) - 2*a(n-3) - a(n-4) + a(n-5) for n>4. (End)
PROG
(PARI) Vec((x^6 - x^4 + x^3 - x - 1)/((x - 1)^3*(x + 1)^2) + O(x^60)) \\ Colin Barker, Mar 04 2017
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Mar 04 2017
STATUS
approved