OFFSET
1,4
COMMENTS
For a guide to related sequences, see A203761.
MATHEMATICA
a[1] = 0; a[2] = 0; a[3] = 1;
a[n_] := SymmetricPolynomial[2, {1 + a[n - 1], a[n - 2], 1 + a[n - 3]}]
Table[a[n], {n, 1, 16}] (* A203900 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 07 2012
STATUS
approved