A194775 Number of lower triangles of an (n+8) X (n+8) 0..5 array with new values introduced in row major order 0..5 and no element unequal to more than one horizontal or vertical neighbor.

1740, 4490, 11857, 31429, 84727, 229869, 631373, 1745459, 4867831, 13649561, 38503606, 109050858, 310061698, 883972100, 2526165997, 7230962925, 20725462609, 59454601239, 170659921683, 490024454069, 1407237659011

Offset

1,1

Comments

Column 5 of A194778.

Links

Table of n, a(n) for n=1..21.

Example

All solutions for 9 X 9 including a 5:
  0                  0                  0                  0
  1 1                1 1                1 1                1 1
  1 1 2              1 1 1              1 1 1              1 1 1
  1 1 2 2            2 2 2 2            2 2 2 2            2 2 2 2
  1 1 2 2 3          2 2 2 2 3          2 2 2 2 2          2 2 2 2 2
  1 1 2 2 3 3        2 2 2 2 3 3        3 3 3 3 3 3        3 3 3 3 3 3
  1 1 2 2 3 3 4      2 2 2 2 3 3 4      3 3 3 3 3 3 3      3 3 3 3 3 3 4
  1 1 2 2 3 3 4 4    2 2 2 2 3 3 4 4    4 4 4 4 4 4 4 4    3 3 3 3 3 3 4 4
  1 1 2 2 3 3 4 4 5  2 2 2 2 3 3 4 4 5  4 4 4 4 4 4 4 4 5  3 3 3 3 3 3 4 4 5

Crossrefs

Sequence in context: A185766 A179160 A043653 * A259302 A251802 A251324

Adjacent sequences: A194772 A194773 A194774 * A194776 A194777 A194778

Keyword

nonn

Author

R. H. Hardin, Sep 02 2011

Status

approved