a(n+2) = a(n+1)*(n mod 3 + 1) + (n mod 2 + 1), a(1) = 11.

Terms

a(0) =11a(1) =12a(2) =26a(3) =79a(4) =81a(5) =163a(6) =491a(7) =492a(8) =986a(9) =2959a(10) =2961a(11) =5923a(12) =17771a(13) =17772a(14) =35546a(15) =106639a(16) =106641a(17) =213283a(18) =639851a(19) =639852a(20) =1279706a(21) =3839119a(22) =3839121a(23) =7678243a(24) =23034731a(25) =23034732a(26) =46069466a(27) =138208399a(28) =138208401a(29) =276416803