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A203769 (-1+A203678(n+1))/2. 2
0, 0, 1, 5, 30, 479, 35369, 36141988, 2591378388181, 187498452473472843625, 971772428248668220494932383712302, 364411657942488572318753161467113186052857526280591219 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..12.

MATHEMATICA

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

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

Table[a[n], {n, 1, 16}]  (* A203768 *)

(Rest[Rest[%]] - 1)/2    (* A203769 *)

CROSSREFS

Cf. A203761, A203769.

Sequence in context: A276752 A052172 A058783 * A264861 A264864 A297472

Adjacent sequences:  A203766 A203767 A203768 * A203770 A203771 A203772

KEYWORD

nonn

AUTHOR

Clark Kimberling, Jan 07 2012

STATUS

approved

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Last modified February 26 08:33 EST 2020. Contains 332277 sequences. (Running on oeis4.)