A251144 - cp's OEIS frontend

A251144 Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

n	a(n)
1	53
2	87
3	143
4	247
5	433
6	777
7	1413
8	2607
9	4863
10	9167
11	17433
12	33417
13	64493
14	125207
15	244303
16	478727
17	941473
18	1857097
19	3672373
20	7277087
21	14444703
22	28712287
23	57137993
24	113812297
25	226874333
26	452534727
27	903105263
28	1803032407
29	3600922513

[53, 87, 143, 247, 433, 777, 1413, 2607, 4863, 9167, 17433, 33417, 64493, 125207, 244303, 478727, 941473, 1857097, 3672373, 7277087, 14444703, 28712287, 57137993, 113812297, 226874333, 452534727, 903105263, 1803032407, 3600922513]

cp's OEIS Frontend

A251144 Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Table of values

List of values