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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
1, 4, 2, 3, 7, 8, 10, 8, 8, 94, 118, 50 (list; graph; refs; listen; history; text; internal format)
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 A026246

Adjacent sequences:  A195950 A195951 A195952 * A195954 A195955 A195956

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 25 2011

STATUS

approved

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Last modified December 10 23:18 EST 2019. Contains 329910 sequences. (Running on oeis4.)