Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 0,0 0,1 1,0 -1,0 or 0,-2.
A264218
Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having directed index change 0,0 0,1 1,0 -1,0 or 0,-2.
Terms
- a(0) =4a(1) =17a(2) =56a(3) =172a(4) =561a(5) =1826a(6) =5880a(7) =18993a(8) =61424a(9) =198472a(10) =641297a(11) =2072482a(12) =6697372a(13) =21642593a(14) =69939048a(15) =226011412a(16) =730364961a(17) =2360204994a(18) =7627103920a(19) =24647309729a(20) =79648825312a(21) =257388562256a(22) =831762066401
External references
- oeis: A264218