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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

Table of n, a(n) for n=1..82.

CROSSREFS

Cf. A274640, A308896.

Sequence in context: A255560 A328472 A046653 * A162190 A134292 A205123

Adjacent sequences:  A308894 A308895 A308896 * A308898 A308899 A308900

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 March 29 05:39 EDT 2020. Contains 333105 sequences. (Running on oeis4.)