OFFSET
1,2
COMMENTS
Klein and Shadmi call these "Organic Numbers".
LINKS
Gan Adam, One Mathematics
Moshe Klein and Doron Shadmi, Organic Mathematics
MAPLE
a := [1, 2]; for n from 3 to 30 do L := series( mul( (1-x^k)^(-a[k]), k=1..n-1)/(1-x^n)^b, x, n+1); t1 := coeff(L, x, n); R := series( 1+x+2*add(a[k]*x^k, k=2..n-1)+2*b*x^n, x, n+1); t2 := coeff(R, x, n); t3 := solve(t1-t2, b); a := [op(a), t3]; od: A056198 := n->a[n];
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Aug 05 2000
EXTENSIONS
Antti Karttunen discovered that the Klein-Shadmi "Organic Numbers" are the same as this sequence. - N. J. A. Sloane, Apr 02 2011
STATUS
approved