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A047875
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Size of smallest polyomino with surround number n (the surround number of a polyomino is the number of different ways that it can be surrounded by non-overlapping copies of the same polyomino).
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5
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7, 1, 5, 9, 8, 9, 9, 4, 8, 7, 9, 9, 9, 9, 8, 9, 6, 9, 8, 8, 9, 8, 8, 7, 9, 8, 7, 8, 8, 9, 8, 8, 9, 9, 8, 9, 9, 9, 9, 8, 9, 6, 8, 9, 10, 9, 9, 8, 6, 7, 8, 8, 8, 9, 8, 9, 9, 9, 10, 9, 9, 8, 9, 9, 9, 9, 9, 9, 9, 8, 9, 9, 7, 8, 8, 9, 9, 7, 8, 7, 9, 9, 9, 9, 9, 9, 8, 9, 9, 9, 9, 9, 9, 9, 8, 9, 9, 8, 9, 9, 9
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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REFERENCES
| W. F. Lunnon, Counting polyominoes, pp. 347-372 of A. O. L. Atkin and B. J. Birch, editors, Computers in Number Theory. Academic Press, NY, 1971.
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LINKS
| E. J. Friedman, Math. Magic
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EXAMPLE
| a(2) = 5 because the smallest polyomino which has a surround number 2 is
..X..
.XXX.
..X..
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CROSSREFS
| Cf. A000105.
Sequence in context: A118307 A178757 A195369 * A064467 A089204 A107786
Adjacent sequences: A047872 A047873 A047874 * A047876 A047877 A047878
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KEYWORD
| nonn
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AUTHOR
| Brendan Owen (bdowen(AT)ee.mu.oz.au)
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