Number of alternating sign n X n matrices that are symmetric about a diagonal.
A005163
Number of alternating sign n X n matrices that are symmetric about a diagonal.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =67a(5) =368a(6) =2630a(7) =24376a(8) =293770a(9) =4610624a(10) =94080653a(11) =2492747656a(12) =85827875506
External references
- oeis: A005163