A280549 - cp's OEIS frontend

A280549 Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and vertical 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	144
5	325
6	670
7	1316
8	2502
9	4654
10	8521
11	15412
12	27612
13	49085
14	86695
15	152282
16	266222
17	463487
18	803970
19	1390026
20	2396244
21	4119894
22	7066303
23	12093158
24	20654128
25	35209707
26	59919341
27	101806274
28	172716156
29	292607401
30	495074182
31	836609600

[0, 9, 50, 144, 325, 670, 1316, 2502, 4654, 8521, 15412, 27612, 49085, 86695, 152282, 266222, 463487, 803970, 1390026, 2396244, 4119894, 7066303, 12093158, 20654128, 35209707, 59919341, 101806274, 172716156, 292607401, 495074182, 836609600]

cp's OEIS Frontend

A280549 Number of n X 3 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

Table of values

List of values