A281199 - cp's OEIS frontend

A281199 Number of n X 2 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

n	a(n)
1	0
2	2
3	10
4	38
5	130
6	420
7	1308
8	3970
9	11822
10	34690
11	100610
12	289032
13	823800
14	2332418
15	6566290
16	18394910
17	51310978
18	142587180
19	394905492
20	1090444930
21	3002921270
22	8249479162
23	22612505090
24	61857842448
25	168903452400
26	460409998850

[0, 2, 10, 38, 130, 420, 1308, 3970, 11822, 34690, 100610, 289032, 823800, 2332418, 6566290, 18394910, 51310978, 142587180, 394905492, 1090444930, 3002921270, 8249479162, 22612505090, 61857842448, 168903452400, 460409998850]

cp's OEIS Frontend

A281199 Number of n X 2 0..1 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

Table of values

List of values