A333459 Number of vertices in an diagonal-edged (or diamond-shaped) checkerboard with width and height 2*n-1 (see Comments in A333434 for definition).

5, 69, 785, 4177, 12681, 33601, 71777, 125389, 238801, 379793, 548293, 878397, 1203101, 1673693, 2311477, 3063609, 3934365, 4931077, 6501545, 7873689, 9852941, 12071685, 14067849, 17728005, 20417893, 24047817, 29003717

Offset: 1

Author

Scott R. Shannon and N. J. A. Sloane, Mar 22 2020

Keywords

• nonn
• more

Comments

See A333434 for the definition and images of the checkerboard.

Crossrefs

Cf. A333434 (regions), A333458 (n-gons), A333460 (edges), A333035, A333031, A330850.

Extensions

a(8)-a(27) from Lars Blomberg, Jun 03 2020