Number of nX4 0..3 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
A201447
Number of nX4 0..3 arrays with every row and column nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.
Terms
- a(0) =1a(1) =9a(2) =29a(3) =112a(4) =261a(5) =846a(6) =1720a(7) =4193a(8) =8065a(9) =16693a(10) =29073a(11) =55954a(12) =90874a(13) =158301a(14) =249828a(15) =409302a(16) =611841a(17) =962288a(18) =1392970a(19) =2091478a(20) =2957586a(21) =4286258a(22) =5893598a(23) =8347259a(24) =11221370a(25) =15440747a(26) =20464931a(27) =27577548a(28) =35834857a(29) =47497364
External references
- oeis: A201447