A281725 - cp's OEIS frontend

A281725 Triangular array T(n,k) is the sum of elements in an n X k matrix that will be assigned the same value whether the integers from 1 to n*k are assigned to elements in row-major order or column-major order.

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	15
7	10
8	9
9	13
10	34
11	15
12	11
13	24
14	21
15	65
16	21
17	13
18	19
19	25
20	31
21	111
22	28
23	15
24	33
25	58
26	54
27	43
28	175
29	36
30	17
31	25
32	33
33	41
34	49
35	57
36	260
37	45
38	19
39	42
40	37
41	115
42	55
43	96
44	73
45	369
46	55
47	21
48	31
49	82
50	51
51	61
52	142
53	81
54	91
55	505
56	66
57	23
58	51
59	45
60	84
61	201
62	117
63	89
64	150
65	111
66	671

[1, 3, 5, 6, 7, 15, 10, 9, 13, 34, 15, 11, 24, 21, 65, 21, 13, 19, 25, 31, 111, 28, 15, 33, 58, 54, 43, 175, 36, 17, 25, 33, 41, 49, 57, 260, 45, 19, 42, 37, 115, 55, 96, 73, 369, 55, 21, 31, 82, 51, 61, 142, 81, 91, 505, 66, 23, 51, 45, 84, 201, 117, 89, 150, 111, 671]

cp's OEIS Frontend

A281725 Triangular array T(n,k) is the sum of elements in an n X k matrix that will be assigned the same value whether the integers from 1 to n*k are assigned to elements in row-major order or column-major order.

Table of values

List of values

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	15
7	10
8	9
9	13
10	34
11	15
12	11
13	24
14	21
15	65
16	21
17	13
18	19
19	25
20	31
21	111
22	28
23	15
24	33
25	58
26	54
27	43
28	175
29	36
30	17
31	25
32	33
33	41
34	49
35	57
36	260
37	45
38	19
39	42
40	37
41	115
42	55
43	96
44	73
45	369
46	55
47	21
48	31
49	82
50	51
51	61
52	142
53	81
54	91
55	505
56	66
57	23
58	51
59	45
60	84
61	201
62	117
63	89
64	150
65	111
66	671

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	15
7	10
8	9
9	13
10	34
11	15
12	11
13	24
14	21
15	65
16	21
17	13
18	19
19	25
20	31
21	111
22	28
23	15
24	33
25	58
26	54
27	43
28	175
29	36
30	17
31	25
32	33
33	41
34	49
35	57
36	260
37	45
38	19
39	42
40	37
41	115
42	55
43	96
44	73
45	369
46	55
47	21
48	31
49	82
50	51
51	61
52	142
53	81
54	91
55	505
56	66
57	23
58	51
59	45
60	84
61	201
62	117
63	89
64	150
65	111
66	671

n	a(n)
1	1
2	3
3	5
4	6
5	7
6	15
7	10
8	9
9	13
10	34
11	15
12	11
13	24
14	21
15	65
16	21
17	13
18	19
19	25
20	31
21	111
22	28
23	15
24	33
25	58
26	54
27	43
28	175
29	36
30	17
31	25
32	33
33	41
34	49
35	57
36	260
37	45
38	19
39	42
40	37
41	115
42	55
43	96
44	73
45	369
46	55
47	21
48	31
49	82
50	51
51	61
52	142
53	81
54	91
55	505
56	66
57	23
58	51
59	45
60	84
61	201
62	117
63	89
64	150
65	111
66	671