Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock equal.
A236721
Number of (n+1)X(1+1) 0..2 arrays with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock equal.
Terms
- a(0) =81a(1) =211a(2) =550a(3) =1517a(4) =4227a(5) =12072a(6) =34817a(7) =101881a(8) =300694a(9) =896941a(10) =2695583a(11) =8170608a(12) =24926541a(13) =76581709a(14) =236571526a(15) =735006969a(16) =2293934715a(17) =7192276024a(18) =22632537625a(19) =71477629985a(20) =226390525302a(21) =719056784565
External references
- oeis: A236721