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

32768, 14348907, 67379894, 147824001, 237368212, 329060365, 421064386, 513095495, 605126604, 697157713, 789188822, 881219931, 973251040, 1065282149, 1157313258, 1249344367, 1341375476, 1433406585, 1525437694, 1617468803

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