Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 filled by rows with each element moved a city block distance of 0 or 1, and rows and columns in increasing lexicographic order.
A263520
Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 filled by rows with each element moved a city block distance of 0 or 1, and rows and columns in increasing lexicographic order.
Terms
- a(0) =8a(1) =35a(2) =160a(3) =660a(4) =2651a(5) =10350a(6) =39807a(7) =151463a(8) =572454a(9) =2153977a(10) =8081566a(11) =30264786a(12) =113201857a(13) =423085492a(14) =1580453125a(15) =5901900685a(16) =22034817900a(17) =82255893847a(18) =307033492332
External references
- oeis: A263520