Number of (n+1) X (1+1) arrays of permutations of 0..n*2+1 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.

A264484

Number of (n+1) X (1+1) arrays of permutations of 0..n*2+1 with each element having directed index change 2,-1 1,0 2,1 0,-1 -2,-2 or -1,0.

Terms

    a(0) =1a(1) =3a(2) =4a(3) =12a(4) =25a(5) =52a(6) =121a(7) =261a(8) =576a(9) =1280a(10) =2809a(11) =6204a(12) =13689a(13) =30167a(14) =66564a(15) =146804a(16) =323761a(17) =714136a(18) =1575025a(19) =3473817a(20) =7661824a(21) =16898560a(22) =37271025a(23) =82203912a(24) =181306225a(25) =399883707a(26) =881971204a(27) =1945248444a(28) =4290381001a(29) =9462732780

External references