A297622 - cp's OEIS frontend

A297622 Triangle read by rows: a(n,k) is the number of k X n matrices which are the first k rows of an alternating sign matrix of size n.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	1
7	3
8	7
9	7
10	1
11	4
12	16
13	42
14	42
15	1
16	5
17	30
18	149
19	429
20	429
21	1
22	6
23	50
24	406
25	2394
26	7436
27	7436
28	1
29	7
30	77
31	938
32	9698
33	65910
34	218348
35	218348
36	1
37	8
38	112
39	1932
40	31920
41	403572
42	3096496
43	10850216
44	10850216
45	1
46	9
47	156
48	3654
49	90576
50	1931325
51	29020904
52	247587252
53	911835460
54	911835460

[1, 1, 1, 1, 2, 2, 1, 3, 7, 7, 1, 4, 16, 42, 42, 1, 5, 30, 149, 429, 429, 1, 6, 50, 406, 2394, 7436, 7436, 1, 7, 77, 938, 9698, 65910, 218348, 218348, 1, 8, 112, 1932, 31920, 403572, 3096496, 10850216, 10850216, 1, 9, 156, 3654, 90576, 1931325, 29020904, 247587252, 911835460, 911835460]

cp's OEIS Frontend

A297622 Triangle read by rows: a(n,k) is the number of k X n matrices which are the first k rows of an alternating sign matrix of size n.

Table of values

List of values