A393449 A392178(n) - A392177(n).

1, 1, -1, -3, -1, -3, 4, 4, 4, 4, 1, 1, 2, 2, 7, 7, 2, 2, -1, -1, -1, 2, 7, 7, 8, 5, 5, 5, 8, 7, 21, 16, 11, 11, 16, 24, 21, 22, 15, 10, 10, 7, 3, 1, 5, 12, 13, 13, 10, 13, 5, 4, 7, 3, 2, -1, -1, -1, -1, -1, 3, 8, 12, 11, 10, 10, 6, -3, -4, -5, -5, -5, -4, -3, -3, 1, -3, -4, -14, 6, 10, 10, 11, 10, 9, 9, 9, -10, -14, -13, -12, 2, -1, 2, -2, -2, -3

Offset

0,4

Comments

a(n) is a measure of the separation between the position of the n-th red knight in the spiral of A392177 & A392178 and the n-th black knight.

Links

N. J. A. Sloane, Table of n, a(n) for n = 0..45762

Example

The sixth black knight in the spiral appears at square 20, while the sixth red knight appears at quare 24, so a(6) = 24-20 = 4.

Crossrefs

Sequence in context: A029152 A320279 A175290 * A089958 A162932 A216036

Adjacent sequences: A393446 A393447 A393448 * A393450 A393451 A393452

Keyword

sign

Author

N. J. A. Sloane, Apr 18 2026

Status

approved