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

A264300

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

Terms

    a(0) =1a(1) =2a(2) =5a(3) =10a(4) =16a(5) =29a(6) =61a(7) =117a(8) =212a(9) =401a(10) =776a(11) =1476a(12) =2777a(13) =5261a(14) =10025a(15) =19042a(16) =36065a(17) =68410a(18) =129940a(19) =246641a(20) =467857a(21) =887753a(22) =1685008a(23) =3197825a(24) =6067984a(25) =11514880a(26) =21852673a(27) =41470425a(28) =78696985a(29) =149342234

External references