A195953 Number of lower triangles of an n X n 0..8 array with each element equal to the number of its diagonal, antidiagonal, horizontal and vertical neighbors unequal to itself

1, 4, 2, 3, 7, 8, 10, 8, 8, 94, 118, 50

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Example

Some solutions for n=10
..2....................2....................2
..3.3..................3.3..................3.3
..4.6.3................4.7.3................5.7.3
..4.6.7.3..............4.8.6.3..............4.8.4.3
..5.8.6.6.3............5.7.6.7.3............5.4.4.4.3
..4.7.5.5.7.3..........4.7.8.6.6.3..........4.8.7.4.6.3
..4.7.5.5.8.6.3........5.4.4.4.4.4.3........5.7.4.4.6.7.3
..5.8.6.6.7.6.7.3......4.7.4.4.6.4.4.3......4.8.4.4.8.6.6.3
..4.7.7.6.7.8.6.6.3....5.8.7.6.6.4.8.7.3....4.7.7.4.7.7.8.7.3
..3.4.5.4.4.5.4.4.3.2..3.4.4.5.4.5.4.5.3.2..3.5.4.5.4.5.4.4.3.2

Crossrefs

Sequence in context: A021240 A306716 A143054 * A016512 A201651 A357463

Adjacent sequences: A195950 A195951 A195952 * A195954 A195955 A195956

Keyword

nonn

Author

R. H. Hardin Sep 25 2011

Status

approved