Number of 2Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself.

A266102

Number of 2Xn integer arrays with each element equal to the number of horizontal and antidiagonal neighbors exactly one smaller than itself.

Terms

    a(0) =1a(1) =5a(2) =13a(3) =36a(4) =100a(5) =233a(6) =680a(7) =2201a(8) =6508a(9) =18689a(10) =55362a(11) =167587a(12) =511996a(13) =1565487a(14) =4772336a(15) =14577149a(16) =44758492a(17) =137803612a(18) =424402090a(19) =1307283605a(20) =4029557464a(21) =12430685471a(22) =38368732042a(23) =118459868528a(24) =365782453416

External references