Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 3 ones in any row or column.
A162111
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in strictly increasing order, and no more than 3 ones in any row or column.
Terms
- a(0) =2a(1) =4a(2) =9a(3) =47a(4) =243a(5) =1498a(6) =9764a(7) =69794a(8) =532844a(9) =4401981a(10) =38603493a(11) =360697300a(12) =3556444163a(13) =36962781800a(14) =403315183322
External references
- oeis: A162111