Number of n X 4 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.
A222440
Number of n X 4 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.
Terms
- a(0) =27a(1) =1029a(2) =39285a(3) =1500183a(4) =57289767a(5) =2187822609a(6) =83550197745
External references
- oeis: A222440