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Search: id:A006772
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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
1
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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; listen)
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OFFSET
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1,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
A. J. Guttmann and I. G. Enting, The size and number of rings on the square lattice, J. Phys. A 21 (1988), L165-L172.
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CROSSREFS
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Sequence in context: A038213 A161939 A001579 this_sequence A009020 A109792 A137177
Adjacent sequences: A006769 A006770 A006771 this_sequence A006773 A006774 A006775
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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