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A365644
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Array read by ascending antidiagonals: A(n, k) = k*(10^n - 1)/9 with k >= 0.
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2
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0, 0, 0, 0, 1, 0, 0, 11, 2, 0, 0, 111, 22, 3, 0, 0, 1111, 222, 33, 4, 0, 0, 11111, 2222, 333, 44, 5, 0, 0, 111111, 22222, 3333, 444, 55, 6, 0, 0, 1111111, 222222, 33333, 4444, 555, 66, 7, 0, 0, 11111111, 2222222, 333333, 44444, 5555, 666, 77, 8, 0
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OFFSET
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0,8
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LINKS
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FORMULA
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O.g.f.: x*y/((1 - x)*(1 - 10*x)*(1 - y)^2).
E.g.f.: y*exp(x+y)*(exp(9*x) - 1)/9.
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EXAMPLE
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The array begins:
0, 0, 0, 0, 0, 0, ...
0, 1, 2, 3, 4, 5, ...
0, 11, 22, 33, 44, 55, ...
0, 111, 222, 333, 444, 555, ...
0, 1111, 2222, 3333, 4444, 5555, ...
0, 11111, 22222, 33333, 44444, 55555, ...
...
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MATHEMATICA
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A[n_, k_]:=k(10^n-1)/9; Table[A[n-k, k], {n, 0, 9}, {k, 0, n}]//Flatten
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CROSSREFS
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Cf. A000004 (n=0 or k=0), A001477 (n=1), A002275 (k=1), A002276 (k=2), A002277 (k=3), A002278 (k=4), A002279 (k=5), A002280 (k=6), A002281 (k=7), A002282 (k=8), A002283 (k=9), A008593 (n=2), A053422 (main diagonal), A105279 (k=10), A132583, A177769 (n=3), A365645 (antidiagonal sums), A365646.
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KEYWORD
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AUTHOR
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STATUS
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approved
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