A194777 Number of lower triangles of an (n+12) X (n+12) 0..7 array with new values introduced in row major order 0..7 and no element unequal to more than one horizontal or vertical neighbor.

85013, 231445, 639753, 1784723, 5044981, 14399939, 41587186, 121261490, 357312638, 1062459348, 3188769448, 9649809740, 29439886715, 90469050263, 279932030931, 871510145365

Offset

1,1

Comments

Column 7 of A194778.

Links

Table of n, a(n) for n=1..16.

Example

Some solutions for 13 X 13 including a 7:
  0                           0
  1 1                         1 1
  1 1 1                       1 1 1
  2 2 2 2                     2 2 2 2
  2 2 2 2 2                   2 2 2 2 2
  3 3 3 3 3 3                 3 3 3 3 3 3
  3 3 3 3 3 3 3               3 3 3 3 3 3 3
  4 4 4 4 4 4 4 4             4 4 4 4 4 4 4 4
  4 4 4 4 4 4 4 4 4           4 4 4 4 4 4 4 4 4
  5 5 5 5 5 5 5 5 5 5         5 5 5 5 5 5 5 5 5 5
  5 5 5 5 5 5 5 5 5 5 6       5 5 5 5 5 5 5 5 5 5 5
  5 5 5 5 5 5 5 5 5 5 6 6     6 6 6 6 6 6 6 6 6 6 6 6
  5 5 5 5 5 5 5 5 5 5 6 6 7   6 6 6 6 6 6 6 6 6 6 6 6 7

Crossrefs

Sequence in context: A205023 A207298 A236668 * A375263 A031671 A371641

Adjacent sequences: A194774 A194775 A194776 * A194778 A194779 A194780

Keyword

nonn

Author

R. H. Hardin, Sep 02 2011

Status

approved