T(n,k) = number of nXk 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1)X(k+1) 0..2 array.
A228977
T(n,k) = number of nXk 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1)X(k+1) 0..2 array.
Terms
- a(0) =3a(1) =9a(2) =9a(3) =27a(4) =81a(5) =27a(6) =81a(7) =729a(8) =729a(9) =81a(10) =243a(11) =6387a(12) =19503a(13) =6387a(14) =243a(15) =729a(16) =55887a(17) =485397a(18) =485397a(19) =55887a(20) =729a(21) =2187a(22) =488037a(23) =11824875a(24) =32175213a(25) =11824875a(26) =488037a(27) =2187a(28) =6561a(29) =4259277
External references
- oeis: A228977