A108410 - cp's OEIS frontend

A108410 Triangle T(n,k) read by rows: number of 12312-avoiding matchings on [2n] with exactly k crossings (n >= 1, 0 <= k <= n-1).

n	a(n)
1	1
2	2
3	1
4	5
5	5
6	2
7	14
8	21
9	15
10	5
11	42
12	84
13	84
14	49
15	14
16	132
17	330
18	420
19	336
20	168
21	42
22	429
23	1287
24	1980
25	1980
26	1350
27	594
28	132
29	1430
30	5005
31	9009
32	10725
33	9075
34	5445
35	2145
36	429
37	4862
38	19448
39	40040
40	55055
41	55055
42	40898
43	22022
44	7865
45	1430
46	16796
47	75582

[1, 2, 1, 5, 5, 2, 14, 21, 15, 5, 42, 84, 84, 49, 14, 132, 330, 420, 336, 168, 42, 429, 1287, 1980, 1980, 1350, 594, 132, 1430, 5005, 9009, 10725, 9075, 5445, 2145, 429, 4862, 19448, 40040, 55055, 55055, 40898, 22022, 7865, 1430, 16796, 75582]

cp's OEIS Frontend

A108410 Triangle T(n,k) read by rows: number of 12312-avoiding matchings on [2n] with exactly k crossings (n >= 1, 0 <= k <= n-1).

Table of values

List of values