Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,2 1,0 or -1,-2.
A264366
Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,2 1,0 or -1,-2.
Terms
- a(0) =1a(1) =6a(2) =36a(3) =120a(4) =400a(5) =1440a(6) =5184a(7) =18432a(8) =65536a(9) =233472a(10) =831744a(11) =2962176a(12) =10549504a(13) =37572864a(14) =133818624a(15) =476601600a(16) =1697440000a(17) =6045523200a(18) =21531453696a(19) =76685407488a(20) =273119121664a(21) =972728179968
External references
- oeis: A264366