Number of (n+1)X(2+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.
A251969
Number of (n+1)X(2+1) 0..3 arrays with nondecreasing sum of every two consecutive values in every row and column.
Terms
- a(0) =1600a(1) =20000a(2) =250000a(3) =1750000a(4) =12250000a(5) =60025000a(6) =294122500a(7) =1129430400a(8) =4337012736a(9) =13940398080a(10) =44808422400a(11) =125737920000a(12) =352836000000a(13) =889440750000
External references
- oeis: A251969