A227259 - cp's OEIS frontend

A227259 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 two or less, with rows and columns of the latter in lexicographically nondecreasing order.

n	a(n)
1	3
2	9
3	23
4	50
5	96
6	168
7	274
8	423
9	625
10	891
11	1233
12	1664
13	2198
14	2850
15	3636
16	4573
17	5679
18	6973
19	8475
20	10206
21	12188
22	14444
23	16998
24	19875
25	23101
26	26703
27	30709
28	35148
29	40050
30	45446
31	51368
32	57849
33	64923
34	72625
35	80991
36	90058
37	99864
38	110448
39	121850
40	134111

[3, 9, 23, 50, 96, 168, 274, 423, 625, 891, 1233, 1664, 2198, 2850, 3636, 4573, 5679, 6973, 8475, 10206, 12188, 14444, 16998, 19875, 23101, 26703, 30709, 35148, 40050, 45446, 51368, 57849, 64923, 72625, 80991, 90058, 99864, 110448, 121850, 134111]

cp's OEIS Frontend

A227259 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 two or less, with rows and columns of the latter in lexicographically nondecreasing order.

Table of values

List of values