a(n) = 12*A002605(n).

Terms

a(0) =0a(1) =12a(2) =24a(3) =72a(4) =192a(5) =528a(6) =1440a(7) =3936a(8) =10752a(9) =29376a(10) =80256a(11) =219264a(12) =599040a(13) =1636608a(14) =4471296a(15) =12215808a(16) =33374208a(17) =91180032a(18) =249108480a(19) =680577024a(20) =1859371008a(21) =5079896064a(22) =13878534144a(23) =37916860416a(24) =103590789120a(25) =283015299072a(26) =773212176384