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A122593 a(n) = 2*a(n - 1) - a(n - 2) - (a(n - 2) - a(n - 1))^2 + (a(n - 2) - a(n - 3))^2. 0

%I

%S 1,1,1,0,0,2,-6,-54,-2184,-4532418,-20523011025492,

%T -421193795514716517978851412,

%U -177404213380075544048510970681865493733941889439557930,-31472254925003374689403264185693337773848906235022202710045975235073779744728

%N a(n) = 2*a(n - 1) - a(n - 2) - (a(n - 2) - a(n - 1))^2 + (a(n - 2) - a(n - 3))^2.

%t a[0] = 1; a[1] = 1; a[2] = 1; a[n_] := a[n] = a[n - 1] - 2*a[n - 1] + a[n - 3]- (a[n - 2] - a[n - 1])^2 + (a[n - 2] - a[n - 3])^2; Table[a[n], {n, 0, 17}]

%K sign

%O 1,6

%A _Roger L. Bagula_, Sep 19 2006

%E Edited by _N. J. A. Sloane_, Sep 21 2006

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Last modified May 11 18:05 EDT 2021. Contains 343805 sequences. (Running on oeis4.)