T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.
A237911
T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum minus the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.
Terms
- a(0) =256a(1) =1780a(2) =1780a(3) =12552a(4) =22128a(5) =12552a(6) =88544a(7) =271292a(8) =271292a(9) =88544a(10) =635200a(11) =3324618a(12) =5802892a(13) =3324618a(14) =635200a(15) =4438816a(16) =40005364a(17) =117244060a(18) =117244060a(19) =40005364a(20) =4438816a(21) =31507328a(22) =490622010a(23) =2545423850a(24) =4562312788a(25) =2545423850
External references
- oeis: A237911