OFFSET
0,1
FORMULA
G.f.: (3-3x+x^3)/((1-x)(1-x^2)^2); a(n)=a(n-1)+2a(n-2)-2a(n-3)-a(n-4)+a(n-5); - Paul Barry, Mar 22 2006
MATHEMATICA
Flatten[ Table[{(n + 2)(n + 3)/2, n(n + 1)/2}, {n, 0, 29}]] (* Robert G. Wilson v *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Stuart M. Ellerstein (ellerstein(AT)aol.com), Oct 10 2005
EXTENSIONS
More terms from Robert G. Wilson v, Oct 11 2005
STATUS
approved