A279979 - cp's OEIS frontend

A279979 Number of 3 X n 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

n	a(n)
1	0
2	9
3	50
4	221
5	822
6	2669
7	8068
8	23169
9	64250
10	173509
11	459148
12	1195219
13	3069280
14	7791834
15	19587853
16	48827241
17	120818815
18	297018329
19	725970958
20	1765237102
21	4272245780
22	10296018246
23	24717636634
24	59130589267
25	140997069400
26	335205034089
27	794714054209
28	1879307452216

[0, 9, 50, 221, 822, 2669, 8068, 23169, 64250, 173509, 459148, 1195219, 3069280, 7791834, 19587853, 48827241, 120818815, 297018329, 725970958, 1765237102, 4272245780, 10296018246, 24717636634, 59130589267, 140997069400, 335205034089, 794714054209, 1879307452216]

cp's OEIS Frontend

A279979 Number of 3 X n 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Table of values

List of values