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A203900
a(n)=f(a(n-1)+1,a(n-2),a(n-3)+1), where f(x,y,z)=yz+zx+xy and (a(1),a(2),a(3))=(0,0,1).
2
0, 0, 1, 2, 7, 36, 391, 17536, 7520303, 134830884224, 1016333764230127711, 137040823237740906153712364032, 139279234211744145176797121311869355242595356863
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
Cf. A203761.
Sequence in context: A002724 A348106 A292206 * A209251 A366670 A368398
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 07 2012
STATUS
approved