Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having index change (+-,+-) 0,0 1,2 or 1,0.
A264004
Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 with each element having index change (+-,+-) 0,0 1,2 or 1,0.
Terms
- a(0) =4a(1) =18a(2) =81a(3) =288a(4) =1024a(5) =3872a(6) =14641a(7) =54450a(8) =202500a(9) =756450a(10) =2825761a(11) =10543232a(12) =39337984a(13) =146821248a(14) =547981281a(15) =2045057058a(16) =7632119044a(17) =28483593842a(18) =106302733681a(19) =396726688800
External references
- oeis: A264004