OFFSET
1,3
FORMULA
EXAMPLE
G.f.: A(x) = x - x^2 + 6*x^3 - 17*x^4 + 30*x^5 - 48*x^6 + 170*x^7 +...
where A(x) = x/(1+2*x-x^2) + x^2/(1+6*x^2+x^4) + x^3/(1+14*x^3-x^6) + x^4/(1+34*x^4+x^8) + x^5/(1+82*x^5-x^10) + x^6/(1+198*x^6+x^12) +...+ x^n/(1 + A002203(n)*x^n + (-1)^n*x^(2*n)) +...
PROG
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Jan 13 2012
STATUS
approved