Number of (n+1)X(4+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.
A233405
Number of (n+1)X(4+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.
Terms
- a(0) =24a(1) =100a(2) =360a(3) =1907a(4) =6931a(5) =21765a(6) =86233a(7) =274628a(8) =965494a(9) =3146010a(10) =10444724a(11) =33097949a(12) =108522965a(13) =338311791a(14) =1086568168a(15) =3360254074a(16) =10607088651a(17) =32550672493a(18) =101662193862
External references
- oeis: A233405