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.
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.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =1a(7) =3a(8) =7a(9) =7a(10) =1a(11) =4a(12) =16a(13) =42a(14) =42a(15) =1a(16) =5a(17) =30a(18) =149a(19) =429a(20) =429a(21) =1a(22) =6a(23) =50a(24) =406a(25) =2394a(26) =7436a(27) =7436a(28) =1a(29) =7
External references
- oeis: A297622