Dirichlet convolution of Bell numbers with themselves.

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =30a(5) =108a(6) =406a(7) =1764a(8) =8284a(9) =42324a(10) =231950a(11) =1357264a(12) =8427194a(13) =55289280a(14) =381798704a(15) =2765918869a(16) =20960284294a(17) =165729748096