Number of 3Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.

A266013

Number of 3Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =4a(4) =11a(5) =18a(6) =27a(7) =43a(8) =62a(9) =112a(10) =191a(11) =310a(12) =548a(13) =883a(14) =1467a(15) =2535a(16) =4210a(17) =6993a(18) =11848a(19) =19780a(20) =33042a(21) =55676a(22) =93207a(23) =155834a(24) =261837a(25) =438753a(26) =734590a(27) =1232614a(28) =2065881a(29) =3460646

External references