Number of (n+2)X3 0..3 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
A184566
Number of (n+2)X3 0..3 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =14178a(1) =102445a(2) =545662a(3) =2430950a(4) =9496395a(5) =33351260a(6) =107058241a(7) =318063303a(8) =883398416a(9) =2312834051a(10) =5747404508a(11) =13634816674a(12) =31030883261a(13) =68030181122a(14) =144179542873a(15) =296289041222a(16) =591935421670
External references
- oeis: A184566