Number of n X 2 array permutations with each element moving zero or one space diagonally, horizontally or vertically.
A189305
Number of n X 2 array permutations with each element moving zero or one space diagonally, horizontally or vertically.
Terms
- a(0) =2a(1) =14a(2) =73a(3) =400a(4) =2177a(5) =11854a(6) =64554a(7) =351521a(8) =1914208a(9) =10423761a(10) =56762346a(11) =309097942a(12) =1683185225a(13) =9165743600a(14) =49911830577a(15) =271793641686
External references
- oeis: A189305