A394303 a(n) is the number of unit squares in the square lattice, divided by 4, that have 3 vertices strictly inside and 1 vertex strictly outside the circle (x-1/2)^2 + (y-1/2)^2 = n, i.e., the circle centered at the deep hole.

0, 0, 0, 1, 1, 0, 0, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 5

Offset

0,8

Links

Hugo Pfoertner, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A005883, A393696, A394301, A394302.

Sequence in context: A342461 A157129 A101615 * A246359 A328114 A343504

Adjacent sequences: A394300 A394301 A394302 * A394304 A394305 A394306

Keyword

nonn

Author

Hugo Pfoertner, Mar 15 2026

Status

approved