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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. 0
1740, 4490, 11857, 31429, 84727, 229869, 631373, 1745459, 4867831, 13649561, 38503606, 109050858, 310061698, 883972100, 2526165997, 7230962925, 20725462609, 59454601239, 170659921683, 490024454069, 1407237659011 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 12 04:28 EDT 2022. Contains 356067 sequences. (Running on oeis4.)