Triangle read by rows: T(n,k) is the number of n X n symmetric binary matrices with k ones in every row and column.
A333157
Triangle read by rows: T(n,k) is the number of n X n symmetric binary matrices with k ones in every row and column.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =4a(8) =4a(9) =1a(10) =1a(11) =10a(12) =18a(13) =10a(14) =1a(15) =1a(16) =26a(17) =112a(18) =112a(19) =26a(20) =1a(21) =1a(22) =76a(23) =820a(24) =1760a(25) =820a(26) =76a(27) =1a(28) =1a(29) =232
External references
- oeis: A333157