Exponential convolution of partition numbers (A000041) with themselves.

Terms

a(0) =1a(1) =2a(2) =6a(3) =18a(4) =58a(5) =184a(6) =586a(7) =1822a(8) =5618a(9) =16980a(10) =50892a(11) =150064a(12) =439210a(13) =1268924a(14) =3640342a(15) =10337596a(16) =29160638a(17) =81570368a(18) =226795202a(19) =626070664a(20) =1718783084a(21) =4689582366a(22) =12730998988a(23) =34373603158a(24) =92385339242a(25) =247099560046a(26) =658137847408