Triangle read by rows: T(n,m) = Prime[m]^n*(Prime[m] - 1)/2.

Terms

a(0) =1a(1) =3a(2) =9a(3) =10a(4) =50a(5) =250a(6) =21a(7) =147a(8) =1029a(9) =7203a(10) =55a(11) =605a(12) =6655a(13) =73205a(14) =805255a(15) =78a(16) =1014a(17) =13182a(18) =171366a(19) =2227758a(20) =28960854a(21) =136a(22) =2312a(23) =39304a(24) =668168a(25) =11358856a(26) =193100552a(27) =3282709384a(28) =171a(29) =3249