Number of (n+1) X (4+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.
A235880
Number of (n+1) X (4+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) =339a(1) =537a(2) =951a(3) =1833a(4) =3759a(5) =8097a(6) =18231a(7) =42873a(8) =105279a(9) =269457a(10) =715911a(11) =1963113a(12) =5520399a(13) =15823617a(14) =45995991a(15) =135038553a(16) =399217119a(17) =1185854577a(18) =3533970471a(19) =10554725193a(20) =31569803439a(21) =94520666337a(22) =283184511351a(23) =848798559033
External references
- oeis: A235880