Triangle T(n,k) defined by Sum_{k=1..n} T(n,k)*u^k*x^n/n! = exp(Sum_{n>0} u*d(n)*x^n/n!), where d(n) is the number of divisors of n.
A338870
Triangle T(n,k) defined by Sum_{k=1..n} T(n,k)*u^k*x^n/n! = exp(Sum_{n>0} u*d(n)*x^n/n!), where d(n) is the number of divisors of n.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =2a(4) =6a(5) =1a(6) =3a(7) =20a(8) =12a(9) =1a(10) =2a(11) =55a(12) =80a(13) =20a(14) =1a(15) =4a(16) =142a(17) =405a(18) =220a(19) =30a(20) =1a(21) =2a(22) =322a(23) =1792a(24) =1785a(25) =490a(26) =42a(27) =1a(28) =4a(29) =779
External references
- oeis: A338870