A018220 - OEIS

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A018220

Row 1 of A018219, i.e., (1, n, a_n) is a winning position.

1

2, 4, 0, 3, 1, 6, 5, 12, 15, 17, 14, 20, 7, 19, 10, 8, 28, 9, 31, 13, 11, 32, 38, 33, 41, 43, 40, 42, 16, 49, 51, 18, 21, 23, 53, 59, 61, 63, 22, 66, 26, 24, 27, 25, 67, 75, 68, 78, 76, 29, 79, 30, 85, 34, 88, 87, 93, 95, 97, 35, 100, 36, 98, 37, 99, 106, 39, 44, 46, 111, 114

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OFFSET

0,1

COMMENTS

Self-inverse when considered as a permutation or function, i.e., a(a(n)) = n.

LINKS

Table of n, a(n) for n=0..70.

Index entries for sequences that are permutations of the natural numbers

CROSSREFS

Sequence in context: A325490 A123514 A064178 * A004580 A215451 A375746

Adjacent sequences: A018217 A018218 A018219 * A018221 A018222 A018223

KEYWORD

nonn

AUTHOR

EXTENSIONS

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

STATUS

approved