Triangle t(n,r) = s(n,r)*s(n,r+1), where s(n,r) = lcm(n,n-1,...,n-r+1)/lcm(1,2,...,r-1,r), n >= 1 and 0 <= r < n.
A241475
Triangle t(n,r) = s(n,r)*s(n,r+1), where s(n,r) = lcm(n,n-1,...,n-r+1)/lcm(1,2,...,r-1,r), n >= 1 and 0 <= r < n.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =3a(4) =9a(5) =3a(6) =4a(7) =24a(8) =12a(9) =2a(10) =5a(11) =50a(12) =100a(13) =50a(14) =5a(15) =6a(16) =90a(17) =150a(18) =50a(19) =5a(20) =1a(21) =7a(22) =147a(23) =735a(24) =1225a(25) =245a(26) =49a(27) =7a(28) =8a(29) =224
External references
- oeis: A241475