Number of (n+1) X (3+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2 X 2 subblock.

A235879

Number of (n+1) X (3+1) 0..2 arrays with the minimum plus the upper median equal to the lower median plus the maximum in every 2 X 2 subblock.

Terms

    a(0) =129a(1) =231a(2) =453a(3) =951a(4) =2109a(5) =4911a(6) =11973a(7) =30471a(8) =80589a(9) =220191a(10) =617493a(11) =1766391a(12) =5127069a(13) =15037071a(14) =44423013a(15) =131892711a(16) =392925549a(17) =1173271551a(18) =3508804533a(19) =10504393431a(20) =31469140029a(21) =94319339631a(22) =282781858053a(23) =847993252551

External references