Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and the median of every three consecutive elements nondecreasing.

A263592

Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and the median of every three consecutive elements nondecreasing.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =16a(4) =41a(5) =108a(6) =280a(7) =729a(8) =1908a(9) =4969a(10) =12950a(11) =33796a(12) =88112a(13) =229740a(14) =599191a(15) =1562470a(16) =4074372a(17) =10625188a(18) =27707446a(19) =72253034a(20) =188417568a(21) =491341657a(22) =1281284446a(23) =3341248089a(24) =8713071846a(25) =22721332009a(26) =59251115518a(27) =154510913809

External references