Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 4 ones in any row or column.
A162112
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 4 ones in any row or column.
Terms
- a(0) =2a(1) =4a(2) =9a(3) =56a(4) =448a(5) =5011a(6) =63524a(7) =940806a(8) =15802494a(9) =298218835a(10) =6312264280a(11) =147191591208
External references
- oeis: A162112