A268803 - cp's OEIS frontend

A268803 Number of n X 2 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.

n	a(n)
1	9
2	34
3	104
4	290
5	772
6	1972
7	4914
8	12010
9	28922
10	68836
11	162274
12	379524
13	881712
14	2036734
15	4681646
16	10714994
17	24430816
18	55516546
19	125777028
20	284188780
21	640549034
22	1440572818
23	3233256010
24	7243375068
25	16199546178
26	36172883716

[9, 34, 104, 290, 772, 1972, 4914, 12010, 28922, 68836, 162274, 379524, 881712, 2036734, 4681646, 10714994, 24430816, 55516546, 125777028, 284188780, 640549034, 1440572818, 3233256010, 7243375068, 16199546178, 36172883716]

cp's OEIS Frontend

A268803 Number of n X 2 0..2 arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two not more than once.

Table of values

List of values