Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 3 ones in any row.
A162037
Number of n X n symmetric binary arrays with rows, considered as binary numbers, in nondecreasing order, and no more than 3 ones in any row.
Terms
- a(0) =2a(1) =5a(2) =17a(3) =69a(4) =309a(5) =1668a(6) =10056a(7) =66792a(8) =487097a(9) =3831282a(10) =32364784a(11) =291650388a(12) =2787435921a(13) =28151860269a(14) =299220983205
External references
- oeis: A162037