T(n,k)=1/120 the number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock containing four distinct values.
A183622
T(n,k)=1/120 the number of (n+1)X(k+1) 0..4 arrays with every 2X2 subblock containing four distinct values.
Terms
- a(0) =1a(1) =6a(2) =6a(3) =36a(4) =56a(5) =36a(6) =216a(7) =528a(8) =528a(9) =216a(10) =1296a(11) =4992a(12) =7792a(13) =4992a(14) =1296a(15) =7776a(16) =47232a(17) =115760a(18) =115760a(19) =47232a(20) =7776a(21) =46656a(22) =446976a(23) =1724208a(24) =2708848a(25) =1724208a(26) =446976a(27) =46656a(28) =279936a(29) =4230144
External references
- oeis: A183622