1/12 the number of (n+2)X5 0..2 arrays with each 3X3 subblock containing three of each value.
A184380
1/12 the number of (n+2)X5 0..2 arrays with each 3X3 subblock containing three of each value.
Terms
- a(0) =2174a(1) =4281a(2) =8936a(3) =21473a(4) =73139a(5) =280347a(6) =1245641a(7) =6472317a(8) =35048783a(9) =197315495a(10) =1149172427a(11) =6748374453a(12) =39939829709a(13) =238066583421
External references
- oeis: A184380