A194535 - cp's OEIS frontend

A194535 Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no element equal to more than one horizontal or vertical neighbor.

n	a(n)
1	1
2	4
3	116
4	16556
5	7721920
6	11525456507
7	54979732214116
8	838387866908847478
9	40866499579695484000499
10	6367568042830726931523028453
11	3171485572844765112503023656979959

[1, 4, 116, 16556, 7721920, 11525456507, 54979732214116, 838387866908847478, 40866499579695484000499, 6367568042830726931523028453, 3171485572844765112503023656979959]

cp's OEIS Frontend

A194535 Number of lower triangles of an n X n 0..3 array with new values introduced in row major order 0..3 and no element equal to more than one horizontal or vertical neighbor.

Table of values

List of values