Intersection of A055932 and A002378.

Terms

a(0) =2a(1) =6a(2) =12a(3) =30a(4) =72a(5) =90a(6) =210a(7) =240a(8) =420a(9) =600a(10) =1260a(11) =6480a(12) =15750a(13) =50400a(14) =147840a(15) =194040a(16) =291060a(17) =510510a(18) =2942940a(19) =4324320a(20) =5762400a(21) =9147600a(22) =19136250a(23) =96049800a(24) =153153000a(25) =15178363200a(26) =37822664880a(27) =401392571580