A183476 - cp's OEIS frontend

A183476 Number of n X 2 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.

n	a(n)
1	3
2	15
3	39
4	135
5	495
6	1647
7	5751
8	20223
9	70119
10	244863
11	855927
12	2985903
13	10426887
14	36416223
15	127148535
16	444006927
17	1550518119
18	5414352255
19	18907098327
20	66024403695
21	230558764743
22	805118884191
23	2811503074743
24	9817858453455

[3, 15, 39, 135, 495, 1647, 5751, 20223, 70119, 244863, 855927, 2985903, 10426887, 36416223, 127148535, 444006927, 1550518119, 5414352255, 18907098327, 66024403695, 230558764743, 805118884191, 2811503074743, 9817858453455]

cp's OEIS Frontend

A183476 Number of n X 2 0..2 arrays with every element equal to either the sum mod 3 of its vertical neighbors or the sum mod 3 of its horizontal neighbors.

Table of values

List of values