A227261 - cp's OEIS frontend

A227261 Number of n X 4 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 5 binary array having a sum of two or less, with rows and columns of the latter in lexicographically nondecreasing order.

n	a(n)
1	5
2	50
3	353
4	2201
5	11932
6	57146
7	244818
8	951917
9	3403038
10	11297855
11	35123154
12	102968348
13	286360987
14	759331583
15	1928166887
16	4706232142
17	11076831313
18	25210805133
19	55622829033
20	119222502647
21	248739253915
22	506020952898

[5, 50, 353, 2201, 11932, 57146, 244818, 951917, 3403038, 11297855, 35123154, 102968348, 286360987, 759331583, 1928166887, 4706232142, 11076831313, 25210805133, 55622829033, 119222502647, 248739253915, 506020952898]

cp's OEIS Frontend

A227261 Number of n X 4 0,1 arrays indicating 2 X 2 subblocks of some larger (n+1) X 5 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