T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with the sum of each 2 X 2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise.
A235506
T(n,k) = Number of (n+1) X (k+1) 0..3 arrays with the sum of each 2 X 2 subblock maximum and minimum lexicographically nondecreasing rowwise and columnwise.
Terms
- a(0) =256a(1) =2982a(2) =2982a(3) =33640a(4) =108648a(5) =33640a(6) =343500a(7) =3945383a(8) =3945383a(9) =343500a(10) =3415268a(11) =123132965a(12) =490074558a(13) =123132965a(14) =3415268a(15) =32611962a(16) =3714091695a(17) =51929974331a(18) =51929974331a(19) =3714091695a(20) =32611962a(21) =306033109a(22) =103423011021
External references
- oeis: A235506