

A051261


Main diagonal of A018219, i.e., (n, n, a_n) is a winning position.


2



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

0,2


LINKS

Table of n, a(n) for n=0..69.
Index entries for sequences that are permutations of the natural numbers


MATHEMATICA

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];
Table[a[n], {n, 0, 69}] (* JeanFrançois Alcover, Aug 19 2019, from A018219 Mma code *)


CROSSREFS

Inverse is A077226.
Sequence in context: A246489 A343624 A309445 * A247621 A245275 A030169
Adjacent sequences: A051258 A051259 A051260 * A051262 A051263 A051264


KEYWORD

nonn,nice


AUTHOR

Michael Kleber


EXTENSIONS

Edited and extended by Christian G. Bower, Oct 29 2002


STATUS

approved



