Number of (n+1)X2 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.
A204303
Number of (n+1)X2 0..3 arrays with the sums of 2X2 subblocks nondecreasing rightwards and downwards.
Terms
- a(0) =256a(1) =2400a(2) =22500a(3) =162000a(4) =1166400a(5) =7157160a(6) =43917129a(7) =242230104a(8) =1336048704a(9) =6835224000a(10) =34969000000a(11) =169317280000a(12) =819821593600
External references
- oeis: A204303