Number of n X 3 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it.
A238721
Number of n X 3 0..2 arrays with no element equal to the sum modulo 3 of elements to its left or elements above it.
Terms
- a(0) =4a(1) =10a(2) =40a(3) =86a(4) =336a(5) =704a(6) =2704a(7) =5660a(8) =21504a(9) =45176a(10) =170464a(11) =359400a(12) =1350272a(13) =2854496a(14) =10694912a(15) =22650672a(16) =84716224a(17) =179637056a(18) =671110848a(19) =1424180800a(20) =5316817088a(21) =11288673952a(22) =42124029504a(23) =89466980000a(24) =333750473152a(25) =708999096096
External references
- oeis: A238721