A048601 - cp's OEIS frontend

A048601 Robbins triangle read by rows: T(n,k) = number of alternating sign n X n matrices with a 1 at top of column k (n >= 1, 1<=k<=n).

n	a(n)
1	1
2	1
3	1
4	2
5	3
6	2
7	7
8	14
9	14
10	7
11	42
12	105
13	135
14	105
15	42
16	429
17	1287
18	2002
19	2002
20	1287
21	429
22	7436
23	26026
24	47320
25	56784
26	47320
27	26026
28	7436
29	218348
30	873392
31	1813968
32	2519400
33	2519400
34	1813968
35	873392
36	218348
37	10850216
38	48825972
39	113927268
40	179028564

[1, 1, 1, 2, 3, 2, 7, 14, 14, 7, 42, 105, 135, 105, 42, 429, 1287, 2002, 2002, 1287, 429, 7436, 26026, 47320, 56784, 47320, 26026, 7436, 218348, 873392, 1813968, 2519400, 2519400, 1813968, 873392, 218348, 10850216, 48825972, 113927268, 179028564]

cp's OEIS Frontend

A048601 Robbins triangle read by rows: T(n,k) = number of alternating sign n X n matrices with a 1 at top of column k (n >= 1, 1<=k<=n).

Table of values

List of values