Powerful numbers (definition 1) sandwiched between twin primes.

Terms

a(0) =4a(1) =72a(2) =108a(3) =432a(4) =1152a(5) =2592a(6) =3528a(7) =9000a(8) =18252a(9) =20808a(10) =21600a(11) =34848a(12) =49392a(13) =69192a(14) =83232a(15) =103968a(16) =139968a(17) =180000a(18) =197568a(19) =264600a(20) =345600a(21) =362952a(22) =438048a(23) =444528a(24) =472392a(25) =649800a(26) =734472a(27) =808992a(28) =995328a(29) =1143072