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A195251 Number of lower triangles of a 5X5 0..n array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by two or less 1
32768, 14348907, 67379894, 147824001, 237368212, 329060365, 421064386, 513095495, 605126604, 697157713, 789188822, 881219931, 973251040, 1065282149, 1157313258, 1249344367, 1341375476, 1433406585, 1525437694, 1617468803 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A195248

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 92031109*n - 223153377 for n>6

EXAMPLE

Some solutions for n=5

..3..........5..........5..........4..........2..........0..........3

..3.5........5.3........3.3........2.2........3.3........1.2........2.1

..3.4.3......3.3.2......3.4.4......2.2.3......3.2.3......3.3.1......3.3.2

..5.4.3.4....5.3.2.0....4.2.3.4....4.2.1.2....2.4.2.4....4.3.2.2....3.1.3.1

..5.5.3.5.4..3.4.2.2.2..2.2.3.3.4..2.2.2.1.1..3.2.2.4.3..3.2.1.3.3..1.1.3.2.2

CROSSREFS

Sequence in context: A017369 A017489 A017621 * A017694 A010803 A236223

Adjacent sequences:  A195248 A195249 A195250 * A195252 A195253 A195254

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 13 2011

STATUS

approved

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Last modified March 28 10:32 EDT 2020. Contains 333083 sequences. (Running on oeis4.)