A268740 - cp's OEIS frontend

A268740 T(n,k)=Number of nXk binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.

n	a(n)
1	0
2	1
3	1
4	2
5	4
6	2
7	5
8	15
9	15
10	5
11	10
12	48
13	80
14	48
15	10
16	20
17	145
18	396
19	396
20	145
21	20
22	38
23	420
24	1788
25	2876
26	1788
27	420
28	38
29	71
30	1183
31	7831
32	19591
33	19591
34	7831
35	1183
36	71
37	130
38	3264
39	33170
40	128232
41	200204
42	128232
43	33170
44	3264
45	130
46	235
47	8865
48	137868
49	816009
50	1971414

[0, 1, 1, 2, 4, 2, 5, 15, 15, 5, 10, 48, 80, 48, 10, 20, 145, 396, 396, 145, 20, 38, 420, 1788, 2876, 1788, 420, 38, 71, 1183, 7831, 19591, 19591, 7831, 1183, 71, 130, 3264, 33170, 128232, 200204, 128232, 33170, 3264, 130, 235, 8865, 137868, 816009, 1971414]

cp's OEIS Frontend

A268740 T(n,k)=Number of nXk binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.

Table of values

List of values