T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise.
A235779
T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise.
Terms
- a(0) =256a(1) =2612a(2) =2612a(3) =23024a(4) =68942a(5) =23024a(6) =180640a(7) =1581879a(8) =1581879a(9) =180640a(10) =1321956a(11) =30969609a(12) =101237218a(13) =30969609a(14) =1321956a(15) =9182760a(16) =545929374a(17) =5639406769a(18) =5639406769a(19) =545929374a(20) =9182760a(21) =61590128a(22) =8741113000a(23) =284827103857
External references
- oeis: A235779