A003827 - cp's OEIS frontend

A003827 'Core' alternating sign n X n matrices, i.e., those that are not 'blown up' from a smaller matrix by inserting row i, column j with a_ij = 1 and all other entries in that row and column equal to 0.

n	a(n)
3	1
4	2
5	59
6	1292
7	53862
8	3615208
9	392961340
10	68986099580
11	19595297946515
12	9048133666290540
13	6832278662513786160
14	8489106538840284343800
15	17456177529017536829265000
16	59700294731704834466701403040
17	340945552945616104095546549396336
18	3261527521637774696821080128931389072

[1, 2, 59, 1292, 53862, 3615208, 392961340, 68986099580, 19595297946515, 9048133666290540, 6832278662513786160, 8489106538840284343800, 17456177529017536829265000, 59700294731704834466701403040, 340945552945616104095546549396336, 3261527521637774696821080128931389072]

cp's OEIS Frontend

A003827 'Core' alternating sign n X n matrices, i.e., those that are not 'blown up' from a smaller matrix by inserting row i, column j with a_ij = 1 and all other entries in that row and column equal to 0.

Table of values

List of values