Number of nX2 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it, modulo 4.
A239643
Number of nX2 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it, modulo 4.
Terms
- a(0) =4a(1) =20a(2) =112a(3) =560a(4) =2874a(5) =14788a(6) =75540a(7) =387306a(8) =1983686a(9) =10160422a(10) =52047250a(11) =266599168a(12) =1365605466a(13) =6995075202a(14) =35830971136a(15) =183537592492a(16) =940137864960
External references
- oeis: A239643