A395359 Number of red knights in the n-th shell of the spiral of black and red knights (as in A392177, A392178, A395355, A395357).

0, 4, 3, 6, 10, 10, 14, 19, 20, 25, 29, 27, 35, 40, 33, 46, 49, 43, 55, 61, 51, 67, 71, 65, 86, 89, 80, 102, 105, 94, 114, 117, 101, 117, 118, 99, 119, 125, 105, 129, 133, 113, 138, 142, 120, 146, 151, 135, 158, 174, 174, 196, 200, 202, 209, 215, 217, 223, 229, 234, 234, 236, 234, 232, 231, 230, 235, 234, 239, 239, 243, 242, 248, 247

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, A395358.

Sequence in context: A128754 A353401 A196889 * A005522 A276202 A215336

Adjacent sequences: A395356 A395357 A395358 * A395360 A395361 A395362

Keyword

nonn

Author

Michael S. Branicky, Feb 12 2026

Status

approved