Triangle read by rows: T[n,k] = number of n X n binary matrices with k=0...n^2 ones, distinct up to cyclic shifts of rows and columns; reflection through any vertical or horizontal axis; and reflection through the main diagonal. Also, quasi-n-ominoes on a torus divided into a k X k grid.
A093466
Triangle read by rows: T[n,k] = number of n X n binary matrices with k=0...n^2 ones, distinct up to cyclic shifts of rows and columns; reflection through any vertical or horizontal axis; and reflection through the main diagonal. Also, quasi-n-ominoes on a torus divided into a k X k grid.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =1a(8) =1a(9) =2a(10) =4a(11) =5a(12) =5a(13) =4a(14) =2a(15) =1a(16) =1a(17) =1a(18) =1a(19) =5a(20) =10a(21) =33a(22) =53a(23) =101a(24) =122a(25) =153a(26) =122a(27) =101a(28) =53a(29) =33
External references
- oeis: A093466