Triangle T(n,k), n>=1, 1<=k<=n, read by rows, where sequence a_k of column k begins with (k+1) 1's and a_k(n) shifts k places down under Dirichlet convolution.
A144374
Triangle T(n,k), n>=1, 1<=k<=n, read by rows, where sequence a_k of column k begins with (k+1) 1's and a_k(n) shifts k places down under Dirichlet convolution.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =1a(6) =4a(7) =2a(8) =1a(9) =1a(10) =9a(11) =2a(12) =2a(13) =1a(14) =1a(15) =18a(16) =5a(17) =2a(18) =2a(19) =1a(20) =1a(21) =40a(22) =4a(23) =3a(24) =2a(25) =2a(26) =1a(27) =1a(28) =80a(29) =12
External references
- oeis: A144374