Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and with no two consecutive decreases.

A263679

Number of length n arrays of permutations of 0..n-1 with each element moved by -4 to 4 places and with no two consecutive decreases.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =17a(4) =70a(5) =277a(6) =1009a(7) =3487a(8) =11708a(9) =39905a(10) =137984a(11) =481005a(12) =1680187a(13) =5852468a(14) =20335048a(15) =70581031a(16) =244962297a(17) =850636578a(18) =2955043270a(19) =10266945188a(20) =35669911963a(21) =123914096828a(22) =430440925456

External references