Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
A253519
Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
Terms
- a(0) =2180a(1) =10706a(2) =30013a(3) =84684a(4) =256914a(5) =791232a(6) =2419612a(7) =7338525a(8) =22126888a(9) =66487395a(10) =199430934a(11) =597738095a(12) =1791132691a(13) =5367324020a(14) =16086064541a(15) =48218959866a(16) =144563723032a(17) =433475686645
External references
- oeis: A253519