A339631 - cp's OEIS frontend

A339631 Number of 3 X n matrices with 3n/2 1's (if n is even) or (3n+1)/2 1's (if n is odd) that do not have a horizontal nor vertical nor diagonal 3-streak of 1's.

n	a(n)
0	1
1	3
2	18
3	16
4	28
5	30
6	58
7	72
8	140
9	178
10	334
11	444
12	824
13	1114
14	2038
15	2808
16	5084
17	7098
18	12730
19	17984
20	32004
21	45656
22	80694
23	116106
24	204004
25	295718
26	516902
27	754226
28	1312336
29	1926060
30	3337682
31	4924188
32	8502132
33	12602416
34	21688182
35	32284214
36	55395140
37	82777240
38	141651742
39	212415744

[1, 3, 18, 16, 28, 30, 58, 72, 140, 178, 334, 444, 824, 1114, 2038, 2808, 5084, 7098, 12730, 17984, 32004, 45656, 80694, 116106, 204004, 295718, 516902, 754226, 1312336, 1926060, 3337682, 4924188, 8502132, 12602416, 21688182, 32284214, 55395140, 82777240, 141651742, 212415744]

cp's OEIS Frontend

A339631 Number of 3 X n matrices with 3n/2 1's (if n is even) or (3n+1)/2 1's (if n is odd) that do not have a horizontal nor vertical nor diagonal 3-streak of 1's.

Table of values

List of values

cp's OEIS Frontend

A339631 Number of 3 X n matrices with 3*n/2 1's (if n is even) or (3*n+1)/2 1's (if n is odd) that do not have a horizontal nor vertical nor diagonal 3-streak of 1's.

Table of values

List of values

A339631 Number of 3 X n matrices with 3n/2 1's (if n is even) or (3n+1)/2 1's (if n is odd) that do not have a horizontal nor vertical nor diagonal 3-streak of 1's.