|
|
A203769
|
|
a(n) = (A203768(n+2) - 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
|
|
|
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
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|