A374975 Number of equivalence classes of lattice polygons contained in a square of side length n but not in a square of side length n-1.

2, 15, 131, 1369, 13842, 129185, 1104895

Offset

1,1

Links

Table of n, a(n) for n=1..7.

Gavin Brown and Alexander M. Kasprzyk, Small polygons and toric codes, J. Symbolic Comput. 51 (2013), pp. 55-62.

Example

For n = 1, only the square itself and the standard triangle are contained in the square, so a(1) = 2.

Crossrefs

Cf. A187015, A322343, A371917.

Sequence in context: A365151 A371585 A140306 * A143924 A217483 A371579

Adjacent sequences: A374972 A374973 A374974 * A374976 A374977 A374978

Keyword

nonn,more

Author

Justus Springer, Jul 26 2024

Status

approved