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Search: id:A073254
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| A073254 |
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Table of n^2+n*k+k^2 by antidiagonals. |
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+0
1
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| 0, 1, 1, 4, 3, 4, 9, 7, 7, 9, 16, 13, 12, 13, 16, 25, 21, 19, 19, 21, 25, 36, 31, 28, 27, 28, 31, 36, 49, 43, 39, 37, 37, 39, 43, 49, 64, 57, 52, 49, 48, 49, 52, 57, 64, 81, 73, 67, 63, 61, 61, 63, 67, 73, 81, 100, 91, 84, 79, 76, 75, 76, 79, 84, 91, 100, 121, 111, 103, 97
(list; table; graph; listen)
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OFFSET
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0,4
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COMMENT
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Norm of elements in planar hexagonal lattice A_2.
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EXAMPLE
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0; 1,1; 4,3,4; 9,7,7,9; 16,13,12,13,16; 25,21,19,19,21,25; ...
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PROGRAM
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(PARI) T(n, k)=n^2+n*k+k^2
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CROSSREFS
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A033994 gives antidiagonal sums. Cf. A004016.
Adjacent sequences: A073251 A073252 A073253 this_sequence A073255 A073256 A073257
Sequence in context: A075246 A132984 A118701 this_sequence A094177 A060374 A074296
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KEYWORD
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nonn,tabl,easy
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AUTHOR
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Michael Somos, Jul 23, 2002
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