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A308897 Walk a rook along the square spiral numbered 1, 2, 3, ... (cf. A274640); a(n) = mex of earlier values the rook can move to. 1
1, 2, 1, 2, 3, 4, 1, 3, 4, 2, 3, 4, 1, 3, 4, 2, 5, 6, 7, 8, 1, 5, 6, 7, 8, 2, 5, 6, 7, 8, 1, 5, 6, 7, 8, 2, 3, 6, 5, 8, 7, 4, 1, 3, 6, 5, 8, 7, 4, 2, 3, 6, 5, 8, 7, 4, 1, 3, 6, 5, 8, 7, 4, 2, 9, 10, 11, 12, 13, 14, 15, 16, 1, 9, 10, 11, 12, 13, 14, 15, 16, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Mex here means "smallest positive missing number".
Add 1 to the terms of A308896.
LINKS
CROSSREFS
Sequence in context: A255560 A328472 A046653 * A353293 A162190 A349325
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jul 02 2019
EXTENSIONS
More terms from Rémy Sigrist, Jul 02 2019
STATUS
approved

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Last modified April 21 11:18 EDT 2024. Contains 371853 sequences. (Running on oeis4.)