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A122590 a(n) = 2*a(n - 1) - a(n - 2) - (a(n - 1)^2 + a(n - 2)^2). 0
1, 1, -1, -5, -35, -1315, -1733045, -3003450166025, -9020712899804610407871655, -81373261220701303171562403760549780420204382316935 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

REFERENCES

S. M. Ulam, Problems in Modern Mathematics, John Wiley and Sons, New York, 1960, page 110

LINKS

Table of n, a(n) for n=1..10.

MATHEMATICA

a[0] = 1; a[1] = 1; a[n_] := a[n] = 2*a[n - 1] - a[n - 2] - (a[n - 1]^2 + a[n - 2]^2); Table[a[n], {n, 0, 10}]

CROSSREFS

Sequence in context: A053420 A321605 A001802 * A057991 A000871 A263882

Adjacent sequences:  A122587 A122588 A122589 * A122591 A122592 A122593

KEYWORD

sign

AUTHOR

Roger L. Bagula, Sep 19 2006

EXTENSIONS

Edited by N. J. A. Sloane, Sep 21 2006

STATUS

approved

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Last modified September 23 14:29 EDT 2020. Contains 337310 sequences. (Running on oeis4.)