Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 3 ones in any row or column.
A162058
Number of n X n symmetric binary arrays with rows, considered as graycode numbers, in nondecreasing order, and no more than 3 ones in any row or column.
Terms
- a(0) =2a(1) =6a(2) =18a(3) =77a(4) =363a(5) =2049a(6) =12734a(7) =88165a(8) =657807a(9) =5333430a(10) =46068228a(11) =424836442a(12) =4143278352a(13) =42649790768a(14) =461486812345
External references
- oeis: A162058