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A006772
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Sum of spans of n-step polygons on square lattice.
(Formerly M2971)
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0
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1, 3, 14, 70, 370, 2028, 11452, 66172, 389416, 2326202, 14070268, 86010680, 530576780, 3298906810, 20653559846, 130099026600, 823979294284, 5244162058026, 33523117491920, 215150177410088
(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: A038213 A161939 A001579 * A009020 A186765 A109792
Adjacent sequences: A006769 A006770 A006771 * A006773 A006774 A006775
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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