A268622 - cp's OEIS frontend

A268622 Number of n X 2 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

n	a(n)
1	9
2	42
3	174
4	666
5	2430
6	8586
7	29646
8	100602
9	336798
10	1115370
11	3661038
12	11927898
13	38618046
14	124357194
15	398580750
16	1272269754
17	4046391774
18	12827922858
19	40550011182
20	127848761370
21	402142467582
22	1262215953162
23	3954013510734

[9, 42, 174, 666, 2430, 8586, 29646, 100602, 336798, 1115370, 3661038, 11927898, 38618046, 124357194, 398580750, 1272269754, 4046391774, 12827922858, 40550011182, 127848761370, 402142467582, 1262215953162, 3954013510734]

cp's OEIS Frontend

A268622 Number of n X 2 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.

Table of values

List of values