Number of arrangements on a line of n finite closed intervals (possibly of zero length) with k distinct endpoints (n >= 1, 1 <= k <= 2*n).
A300729
Number of arrangements on a line of n finite closed intervals (possibly of zero length) with k distinct endpoints (n >= 1, 1 <= k <= 2*n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =7a(4) =12a(5) =6a(6) =1a(7) =25a(8) =138a(9) =294a(10) =270a(11) =90a(12) =1a(13) =79a(14) =1056a(15) =5298a(16) =12780a(17) =16020a(18) =10080a(19) =2520a(20) =1a(21) =241a(22) =7050a(23) =70350a(24) =334710a(25) =875970a(26) =1335600a(27) =1184400a(28) =567000a(29) =113400
External references
- oeis: A300729