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A203772 a(n)=f(a(n-1),a(n-2)+1,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, 3, 11, 74, 1232, 108084, 141466347, 15464951390151, 2189441739723579832963, 33859919808724254529558716855414396, 74134322256556148244446056491575979484293791968668948464 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

For a guide to related sequences, see A203761.

LINKS

Table of n, a(n) for n=1..13.

MATHEMATICA

a[1] = 0; a[2] = 0; a[3] = 1;

a[n_] := SymmetricPolynomial[2, {a[n - 1], 1 + a[n - 2], 1 + a[n - 3]}]

Table[a[n], {n, 1, 14}]  (* A203772 *)

CROSSREFS

Cf. A203761.

Sequence in context: A035378 A258387 A054461 * A290025 A181388 A196691

Adjacent sequences:  A203769 A203770 A203771 * A203773 A203774 A203775

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 07 2012

STATUS

approved

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Last modified February 22 09:22 EST 2020. Contains 332133 sequences. (Running on oeis4.)