A244312 - cp's OEIS frontend

A244312 Triangle read by rows: T(n,k) is the number of single loop solutions formed by n proper arches (connecting odd vertices to even vertices in the range 1 to 2n) above the x axis, k of which connect an odd vertex to a higher even vertex, with a rainbow of n arches below the x axis.

n	a(n)
1	1
2	0
3	1
4	0
5	2
6	0
7	0
8	2
9	4
10	0
11	0
12	4
13	16
14	4
15	0
16	0
17	4
18	48
19	60
20	8
21	0
22	0
23	8
24	160
25	384
26	160
27	8
28	0
29	0
30	8
31	368
32	1952
33	2176
34	520
35	16
36	0
37	0
38	16
39	1152
40	9648
41	18688
42	9648
43	1152
44	16
45	0
46	0
47	16
48	2432
49	37008
50	132640
51	141680
52	45504
53	3568
54	32
55	0

[1, 0, 1, 0, 2, 0, 0, 2, 4, 0, 0, 4, 16, 4, 0, 0, 4, 48, 60, 8, 0, 0, 8, 160, 384, 160, 8, 0, 0, 8, 368, 1952, 2176, 520, 16, 0, 0, 16, 1152, 9648, 18688, 9648, 1152, 16, 0, 0, 16, 2432, 37008, 132640, 141680, 45504, 3568, 32, 0]

cp's OEIS Frontend

A244312 Triangle read by rows: T(n,k) is the number of single loop solutions formed by n proper arches (connecting odd vertices to even vertices in the range 1 to 2n) above the x axis, k of which connect an odd vertex to a higher even vertex, with a rainbow of n arches below the x axis.

Table of values

List of values