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A051261
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Main diagonal of A018219, i.e., (n, n, a_n) is a winning position.
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2
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0, 4, 6, 1, 3, 7, 11, 2, 5, 10, 17, 23, 21, 9, 28, 26, 24, 8, 34, 12, 35, 13, 32, 29, 44, 19, 45, 15, 18, 14, 57, 56, 16, 20, 58, 48, 25, 54, 73, 76, 72, 27, 75, 82, 62, 66, 84, 87, 71, 78, 95, 31, 74, 94, 97, 103, 22, 40, 39, 30, 86, 33, 41, 91, 46, 42, 117, 119, 122, 37
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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mex[s_] := Min[Complement[Range[0, Max[{s, -1}] + 1], Flatten[s]]];
f[s_] := Join[s, s + Table[i, {i, Length[s]}]];
T[n_, k_] := T[n, k] = mex[{f[Table[T[n - i, k], {i, n}]], f[Table[T[n, k - i], {i, k}]], f[Table[T[n - i, k - i], {i, Min[n, k]}]]}];
a[n_] := T[n, n];
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CROSSREFS
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KEYWORD
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nonn,nice
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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