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 A019473 Number of stable n-celled patterns ("still lifes") in Conway's game of Life. 12
 0, 0, 0, 2, 1, 5, 4, 9, 10, 25, 46, 121, 240, 619, 1353, 3286, 7773, 19044, 45759, 112243, 273188, 672172, 1646147, 4051732, 9971377, 24619307, 60823008, 150613157, 373188952, 926068847, 2299616637, 5716948683 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS S. Ekstrom, Enumerating Still Lifes (in C) N. D. Elkies, [math/9905194] The still-Life density problem and its generalizations, arXiv:math/9905194 [math.CO], 1999. H. Koenig, Stable Objects (another version of this sequence) Mark D. Niemiec, Life Object Counts R. C. Schroeppel, A few mathematical experiments Eric Weisstein's World of Mathematics, Life EXAMPLE a(4)=2 because the block and the tub are the only 4-cell still lifes. CROSSREFS Cf. A056613, A056614, A056605. Sequence in context: A259791 A207480 A166517 * A056605 A091802 A144240 Adjacent sequences:  A019470 A019471 A019472 * A019474 A019475 A019476 KEYWORD hard,nonn,nice AUTHOR EXTENSIONS More terms from Stephen A. Silver, Dec 11 1999 a(24) corrected, at the suggestion of Mark Niemiec, by Nathaniel Johnston, Aug 26 2016 a(24)-a(28) corrected, using data computed by Simon Ekstrom, by Adam P. Goucher, Jan 08 2017 a(31)-a(32) from Nathaniel Johnston, using a script made by Simon Ekstrom, May 25 2017 STATUS approved

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Last modified August 20 09:24 EDT 2017. Contains 290834 sequences.