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

A264365

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

Terms

    a(0) =1a(1) =3a(2) =9a(3) =18a(4) =36a(5) =78a(6) =169a(7) =364a(8) =784a(9) =1680a(10) =3600a(11) =7740a(12) =16641a(13) =35733a(14) =76729a(15) =164815a(16) =354025a(17) =760410a(18) =1633284a(19) =3508110a(20) =7535025a(21) =16184520a(22) =34762816a(23) =74666944a(24) =160376896a(25) =344473464a(26) =739894401a(27) =1589218425a(28) =3413480625a(29) =7331811675

External references