A199128 - cp's OEIS frontend

A199128 Number of nX3 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor.

n	a(n)
1	1
2	2
3	6
4	19
5	70
6	264
7	1038
8	4155
9	16896
10	69584
11	289146
12	1211873
13	5111178
14	21686612
15	92453594
16	395888507
17	1701506820
18	7337867736
19	31739124866
20	137656095241
21	598476364166
22	2607710997676
23	11385288787534
24	49800060551081

[1, 2, 6, 19, 70, 264, 1038, 4155, 16896, 69584, 289146, 1211873, 5111178, 21686612, 92453594, 395888507, 1701506820, 7337867736, 31739124866, 137656095241, 598476364166, 2607710997676, 11385288787534, 49800060551081]

cp's OEIS Frontend

A199128 Number of nX3 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and no element equal to any horizontal or vertical neighbor.

Table of values

List of values