Number of nonnegative integer matrices with 2 distinct columns and any number of distinct nonzero rows with column sums n and columns in decreasing lexicographic order.
A331706
Number of nonnegative integer matrices with 2 distinct columns and any number of distinct nonzero rows with column sums n and columns in decreasing lexicographic order.
Terms
- a(0) =0a(1) =1a(2) =6a(3) =42a(4) =268a(5) =1239a(6) =7278a(7) =40828a(8) =201084a(9) =1044693a(10) =5171998a(11) =24532674a(12) =116470596a(13) =546141979a(14) =2505755010a(15) =11318525016a(16) =50046272884a(17) =219637249269a(18) =944072863998
External references
- oeis: A331706