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A006773
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Sum of squared spans of n-step polygons on square lattice.
(Formerly M3959)
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0
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1, 5, 30, 186, 1164, 7344, 46732, 299604, 1932900, 12537542, 81705782, 534663812, 3511466838, 23136724382, 152888000934, 1012925595468, 6726766841438, 44767880394634
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| A. J. Guttmann and I. G. Enting, The size and number of rings on the square lattice, J. Phys. A 21 (1988), L165-L172.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A076036 A195257 A161407 * A059273 A038744 A098663
Adjacent sequences: A006770 A006771 A006772 * A006774 A006775 A006776
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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