Number of terms in the fully expanded n-th derivative of x^(x^x).

Terms

a(0) =1a(1) =3a(2) =12a(3) =30a(4) =64a(5) =113a(6) =188a(7) =285a(8) =415a(9) =577a(10) =780a(11) =1017a(12) =1312a(13) =1648a(14) =2044a(15) =2489a(16) =3008a(17) =3583a(18) =4236a(19) =4953a(20) =5760a(21) =6638a(22) =7611a(23) =8664a(24) =9822a(25) =11069a(26) =12426a(27) =13880a(28) =15455a(29) =17131