A227161 - cp's OEIS frontend

A227161 Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 binary array having a sum of one or less, with rows and columns of the latter in lexicographically nondecreasing order.

n	a(n)
0	1
1	3
2	8
3	18
4	36
5	66
6	113
7	183
8	283
9	421
10	606
11	848
12	1158
13	1548
14	2031
15	2621
16	3333
17	4183
18	5188
19	6366
20	7736
21	9318
22	11133
23	13203
24	15551
25	18201
26	21178
27	24508
28	28218
29	32336
30	36891
31	41913
32	47433
33	53483
34	60096
35	67306
36	75148
37	83658
38	92873
39	102831
40	113571
41	125133

[1, 3, 8, 18, 36, 66, 113, 183, 283, 421, 606, 848, 1158, 1548, 2031, 2621, 3333, 4183, 5188, 6366, 7736, 9318, 11133, 13203, 15551, 18201, 21178, 24508, 28218, 32336, 36891, 41913, 47433, 53483, 60096, 67306, 75148, 83658, 92873, 102831, 113571, 125133]

cp's OEIS Frontend

A227161 Number of n X 2 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 3 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