A197666 - cp's OEIS frontend

A197666 Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.

n	a(n)
1	3
2	9
3	22
4	71
5	217
6	642
7	1963
8	5963
9	18018
10	54753
11	166329
12	504940
13	1534985
14	4667983
15	14198968
16	43215503
17	131584139
18	400800484
19	1221337807
20	3723140135
21	11353757744
22	34635822651
23	105696236527
24	322652635812
25	985253141189
26	3009481166143

[3, 9, 22, 71, 217, 642, 1963, 5963, 18018, 54753, 166329, 504940, 1534985, 4667983, 14198968, 43215503, 131584139, 400800484, 1221337807, 3723140135, 11353757744, 34635822651, 105696236527, 322652635812, 985253141189, 3009481166143]

cp's OEIS Frontend

A197666 Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,0,1,0,1 for x=0,1,2,3,4.

Table of values

List of values