A143944 - cp's OEIS frontend

A143944 Triangle read by rows: T(n,k) is the number of unordered pairs of vertices at distance k from each other in the grid P_n X P_n (1 <= k <= 2n-2), where P_n is the path graph on n vertices.

n	a(n)
2	4
3	2
4	12
5	14
6	8
7	2
8	24
9	34
10	32
11	20
12	8
13	2
14	40
15	62
16	68
17	60
18	40
19	20
20	8
21	2
22	60
23	98
24	116
25	116
26	100
27	70
28	40
29	20
30	8
31	2
32	84
33	142
34	176
35	188
36	180
37	154
38	112
39	70
40	40
41	20
42	8
43	2
44	112
45	194
46	248
47	276
48	280
49	262
50	224
51	168
52	112
53	70
54	40
55	20
56	8
57	2
58	144
59	254
60	332
61	380
62	400
63	394
64	364
65	312
66	240

[4, 2, 12, 14, 8, 2, 24, 34, 32, 20, 8, 2, 40, 62, 68, 60, 40, 20, 8, 2, 60, 98, 116, 116, 100, 70, 40, 20, 8, 2, 84, 142, 176, 188, 180, 154, 112, 70, 40, 20, 8, 2, 112, 194, 248, 276, 280, 262, 224, 168, 112, 70, 40, 20, 8, 2, 144, 254, 332, 380, 400, 394, 364, 312, 240]

cp's OEIS Frontend

A143944 Triangle read by rows: T(n,k) is the number of unordered pairs of vertices at distance k from each other in the grid P_n X P_n (1 <= k <= 2n-2), where P_n is the path graph on n vertices.

Table of values

List of values

n	a(n)
2	4
3	2
4	12
5	14
6	8
7	2
8	24
9	34
10	32
11	20
12	8
13	2
14	40
15	62
16	68
17	60
18	40
19	20
20	8
21	2
22	60
23	98
24	116
25	116
26	100
27	70
28	40
29	20
30	8
31	2
32	84
33	142
34	176
35	188
36	180
37	154
38	112
39	70
40	40
41	20
42	8
43	2
44	112
45	194
46	248
47	276
48	280
49	262
50	224
51	168
52	112
53	70
54	40
55	20
56	8
57	2
58	144
59	254
60	332
61	380
62	400
63	394
64	364
65	312
66	240

n	a(n)
2	4
3	2
4	12
5	14
6	8
7	2
8	24
9	34
10	32
11	20
12	8
13	2
14	40
15	62
16	68
17	60
18	40
19	20
20	8
21	2
22	60
23	98
24	116
25	116
26	100
27	70
28	40
29	20
30	8
31	2
32	84
33	142
34	176
35	188
36	180
37	154
38	112
39	70
40	40
41	20
42	8
43	2
44	112
45	194
46	248
47	276
48	280
49	262
50	224
51	168
52	112
53	70
54	40
55	20
56	8
57	2
58	144
59	254
60	332
61	380
62	400
63	394
64	364
65	312
66	240

n	a(n)
2	4
3	2
4	12
5	14
6	8
7	2
8	24
9	34
10	32
11	20
12	8
13	2
14	40
15	62
16	68
17	60
18	40
19	20
20	8
21	2
22	60
23	98
24	116
25	116
26	100
27	70
28	40
29	20
30	8
31	2
32	84
33	142
34	176
35	188
36	180
37	154
38	112
39	70
40	40
41	20
42	8
43	2
44	112
45	194
46	248
47	276
48	280
49	262
50	224
51	168
52	112
53	70
54	40
55	20
56	8
57	2
58	144
59	254
60	332
61	380
62	400
63	394
64	364
65	312
66	240