a(n) = 2^n + 3^n + 5*n.

Terms

a(0) =2a(1) =10a(2) =23a(3) =50a(4) =117a(5) =300a(6) =823a(7) =2350a(8) =6857a(9) =20240a(10) =60123a(11) =179250a(12) =535597a(13) =1602580a(14) =4799423a(15) =14381750a(16) =43112337a(17) =129271320a(18) =387682723a(19) =1162785850a(20) =3487833077a(21) =10462450460a(22) =31385254023a(23) =94151567550a(24) =282446313817a(25) =847322164000