A227162 - cp's OEIS frontend

A227162 Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

n	a(n)
1	4
2	18
3	62
4	193
5	558
6	1507
7	3828
8	9149
9	20609
10	43918
11	88960
12	172130
13	319637
14	572050
15	990413
16	1664308
17	2722302
18	4345275
19	6783191
20	10375943
21	15578976
22	22994469
23	33408938
24	47838207
25	67580783
26	94280764
27	130001506
28	177311376
29	239383023

[4, 18, 62, 193, 558, 1507, 3828, 9149, 20609, 43918, 88960, 172130, 319637, 572050, 990413, 1664308, 2722302, 4345275, 6783191, 10375943, 15578976, 22994469, 33408938, 47838207, 67580783, 94280764, 130001506, 177311376, 239383023]

cp's OEIS Frontend

A227162 Number of n X 3 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 4 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

Table of values

List of values