A229841 - cp's OEIS frontend

A229841 Number of n X 2 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j).

n	a(n)
1	3
2	15
3	81
4	423
5	2247
6	11925
7	63291
8	335943
9	1783137
10	9464655
11	50237151
12	266652213
13	1415355027
14	7512519135
15	39875467761
16	211653760983
17	1123430446167
18	5963021689365
19	31650938239371
20	167999035324503
21	891716879181057

[3, 15, 81, 423, 2247, 11925, 63291, 335943, 1783137, 9464655, 50237151, 266652213, 1415355027, 7512519135, 39875467761, 211653760983, 1123430446167, 5963021689365, 31650938239371, 167999035324503, 891716879181057]

cp's OEIS Frontend

A229841 Number of n X 2 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value 2-x(i,j).

Table of values

List of values