Number of nX4 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order.
A206688
Number of nX4 0..3 arrays with no element equal to another within two positions in the same row or column, and new values 0..3 introduced in row major order.
Terms
- a(0) =2a(1) =36a(2) =176a(3) =916a(4) =4704a(5) =24492a(6) =127008a(7) =660888a(8) =3436488a(9) =17884080a(10) =93059016a(11) =484334480a(12) =2520695968a(13) =13119605656a(14) =68284077520a(15) =355405952496
External references
- oeis: A206688