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Search: id:A083487
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| A083487 |
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Triangle read by rows: T(l,c) 2lc + l + c (1 <= c <= l). |
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+0
7
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| 4, 7, 12, 10, 17, 24, 13, 22, 31, 40, 16, 27, 38, 49, 60, 19, 32, 45, 58, 71, 84, 22, 37, 52, 67, 82, 97, 112, 25, 42, 59, 76, 93, 110, 127, 144, 28, 47, 66, 85, 104, 123, 142, 161, 180, 31, 52, 73, 94, 115, 136, 157, 178, 199, 220, 34, 57, 80, 103, 126, 149, 172, 195
(list; table; graph; listen)
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OFFSET
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1,1
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COMMENT
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T(l,c) gives number of edges (of unit length) in a c X l grid.
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EXAMPLE
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Triangle begins:
4,
7,12,
10,17,24,
13,22,31,40,
16,27,38,49,60,
...
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CROSSREFS
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Cf. A082652, A083003. See A151890 for another version.
Sequence in context: A128836 A061956 A072732 this_sequence A092572 A092574 A058271
Adjacent sequences: A083484 A083485 A083486 this_sequence A083488 A083489 A083490
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KEYWORD
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nonn,tabl
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AUTHOR
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Artemario Tadeu Medeiros da Silva (artemario(AT)uol.com.br), Jun 09 2003
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EXTENSIONS
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Edited by N. J. A. Sloane, Jul 23 2009
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