a(n) = Sum_{ r = 0 to n} L(n,r), where L(n,r) (A067049) = lcm(n, n-1, n-2, ..., n-r+1)/lcm(1, 2, 3, ..., r).
A061297
a(n) = Sum_{ r = 0 to n} L(n,r), where L(n,r) (A067049) = lcm(n, n-1, n-2, ..., n-r+1)/lcm(1, 2, 3, ..., r).
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =32a(6) =39a(7) =114a(8) =166a(9) =266a(10) =421a(11) =1608a(12) =1005a(13) =3980a(14) =6894a(15) =4206a(16) =8666a(17) =40904a(18) =49559a(19) =315478a(20) =162321a(21) =79180a(22) =269878a(23) =1647124a(24) =937553a(25) =1810092a(26) =8445654a(27) =7791356a(28) =3978238a(29) =33071544
External references
- oeis: A061297