Square array T(m,n) = number of ways to draw m-1 horizontal lines [a(i),b(i)] with 0 <= a(i) < b(i) <= n such that if two lines start or end on the same coordinate, no intermediate line crosses this coordinate (see comments); m, n >= 1.
A298636
Square array T(m,n) = number of ways to draw m-1 horizontal lines [a(i),b(i)] with 0 <= a(i) < b(i) <= n such that if two lines start or end on the same coordinate, no intermediate line crosses this coordinate (see comments); m, n >= 1.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =6a(8) =9a(9) =1a(10) =1a(11) =10a(12) =36a(13) =23a(14) =1a(15) =1a(16) =15a(17) =100a(18) =181a(19) =53a(20) =1a(21) =1a(22) =21a(23) =225a(24) =845a(25) =775a(26) =115a(27) =1a(28) =1a(29) =28
External references
- oeis: A298636