A227383 - cp's OEIS frontend

A227383 Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order.

n	a(n)
1	5
2	30
3	185
4	1104
5	6160
6	31073
7	141192
8	581706
9	2192737
10	7631150
11	24723499
12	75114814
13	215382006
14	586096131
15	1520882101
16	3779307010
17	9026380556
18	20787492011
19	46293089506
20	99943655427
21	209652253128
22	428180495383

[5, 30, 185, 1104, 6160, 31073, 141192, 581706, 2192737, 7631150, 24723499, 75114814, 215382006, 586096131, 1520882101, 3779307010, 9026380556, 20787492011, 46293089506, 99943655427, 209652253128, 428180495383]

cp's OEIS Frontend

A227383 Number of nX4 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X5 binary array having a sum of one, with rows and columns of the latter in lexicographically nondecreasing order.

Table of values

List of values