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A182831
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Joint-rank array of numbers j*r^(i-1), where r=1+sqrt(2), read by antidiagonals.
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2
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1, 2, 3, 4, 6, 8, 5, 11, 17, 22, 7, 14, 28, 45, 55, 9, 19, 37, 70, 112, 137, 10, 23, 48, 93, 171, 276, 334, 12, 26, 57, 118, 228, 417, 671, 812, 13, 31, 66, 141, 287, 556, 1010, 1627, 1965, 15, 34, 77, 164, 344, 697, 1347, 2444, 3934, 4751, 16, 39
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OFFSET
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1,2
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COMMENTS
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Every positive integer occurs exactly once, so that as a sequence, this is a permutation of the positive integers.
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LINKS
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FORMULA
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T(i,j) = Sum_{n>=1} floor(j*(1+sqrt(2))^(i-n))).
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EXAMPLE
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Northwest corner:
1 2 4 5 ...
3 6 11 14 ...
8 17 28 37 ...
22 45 70 93 ...
...
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MATHEMATICA
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T[n_, k_] := Sum[Floor[k*(1 + Sqrt[2])^(n - j)], {j, 1, 100}]; Table[T[k + 1, n - k], {n, 1, 10}, {k, 0, n-1}]//Flatten (* G. C. Greubel, Aug 18 2018 *)
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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