A194930 Number of lower triangles of an n X n 0..7 array with no element differing from any of its horizontal or vertical neighbors by more than one

8, 62, 1070, 40194, 3308286, 596729942, 236134568314, 205098663583642, 391167151610036562, 1638606240965437583666, 15079495677916351972815638, 304904458867761348224836330046, 13547381816347935357119939144563302

Offset

1,1

Comments

Column 7 of A194931

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for 4X4
..5........3........2........1........2........5........5........1
..4.5......2.1......3.2......2.3......1.1......4.3......4.4......1.1
..4.5.6....1.2.1....4.3.3....3.4.4....2.1.2....3.4.4....5.5.4....1.1.2
..5.6.7.7..2.1.0.0..4.3.2.2..3.4.3.3..2.1.1.0..4.3.4.5..5.5.4.4..1.2.3.3

Crossrefs

Sequence in context: A099335 A356238 A374421 * A346625 A132506 A080270

Adjacent sequences: A194927 A194928 A194929 * A194931 A194932 A194933

Keyword

nonn

Author

R. H. Hardin Sep 05 2011

Status

approved