Number of (1+1)X(n+1) arrays of permutations of 0..n*2+1 with each element having index change +-(.,.) 0,0 0,2 or 1,2.
A264132
Number of (1+1)X(n+1) arrays of permutations of 0..n*2+1 with each element having index change +-(.,.) 0,0 0,2 or 1,2.
Terms
- a(0) =1a(1) =5a(2) =25a(3) =80a(4) =256a(5) =976a(6) =3721a(7) =13725a(8) =50625a(9) =189225a(10) =707281a(11) =2637376a(12) =9834496a(13) =36706880a(14) =137007025a(15) =511286105a(16) =1908029761a(17) =7120920301a(18) =26575846441a(19) =99181976400a(20) =370150560000
External references
- oeis: A264132