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A162547
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Somos-4 variant: a(n)=(4*a(n-1)*a(n-3)-4*a(n-2)^2)/a(n-4), (n!=4k+1).
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1
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1, 0, -4, -16, -64, 0, 4096, 65536, 1048576, 0, -1073741824, -68719476736, -4398046511104, 0, 72057594037927936, 18446744073709551616, 4722366482869645213696, 0, -1237940039285380274899124224
(list; graph; refs; listen; history; internal format)
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