id:A065068 - OEIS Search Results

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Number of fixed polyominoes with n cells of which no four are equally spaced on a straight line.

+0
2

1, 2, 6, 17, 45, 114, 264, 545, 1061, 2070, 3990, 7275, 12556, 20824, 33584, 52753, 80560, 119274, 170168, 232700, 306472, 396580, 517300, 688736, 926816, 1241720, 1640968, 2130448, 2710356, 3383596, 4171788, 5120776, 6289760, 7747928, 9582196, 11908872, 14887792, 18732340, 23712492, 30141180, 38341172, 48622328, 61275752, 76578628, 94786504, 116132688, 140870564, 169379536, 202262720, 240326780, 284337040, 334532714, 389976092 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(n) = 0 for all sufficiently large n, although a(142) is positive - see the link.`
	LINKS	`Jan Kristian Haugland, Illustration for n = 142`
	CROSSREFS	`Cf. A001168.` `Sequence in context: A018024 A000996 A020963 this_sequence A109961 A005592 A102403` `Adjacent sequences: A065065 A065066 A065067 this_sequence A065069 A065070 A065071`
	KEYWORD	`nonn`
	AUTHOR	`Jan Kristian Haugland (jankrihau(AT)hotmail.com), Nov 07 2001`
	EXTENSIONS	`a(32) - a(53) from Brendan Owen (brendan_owen(AT)yahoo.com), Mar 11, 2002`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

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