A395358 Number of black knights in the n-th shell of the spiral of black and red knights (as in A392177, A392178, A395355, A395357).

1, 2, 5, 7, 10, 13, 12, 17, 20, 23, 28, 30, 35, 42, 41, 48, 57, 49, 59, 66, 57, 72, 70, 61, 76, 77, 67, 85, 86, 74, 95, 95, 82, 109, 113, 104, 129, 135, 117, 146, 149, 132, 157, 165, 143, 174, 168, 156, 171, 165, 163, 172, 173, 178, 179, 186, 187, 193, 194, 202, 202, 211, 217, 230, 238, 249, 258, 262, 269, 275, 281, 286, 293, 298, 305

Offset

0,2

Comments

The n-th shell of the spiral consists of the 8*n squares (2*n-1)^2, ..., (2*n+1)^2 - 1.

Links

Michael S. Branicky, Table of n, a(n) for n = 0..4746

Crossrefs

Cf. A392177, A392178, A395355, A395357, A395359.

Sequence in context: A346155 A298869 A219666 * A026340 A331833 A018717

Adjacent sequences: A395355 A395356 A395357 * A395359 A395360 A395361

Keyword

nonn

Author

Michael S. Branicky, Feb 12 2026

Status

approved