Some nontrivial permutation of digits is a factorial number.

Terms

a(0) =10a(1) =20a(2) =42a(3) =60a(4) =100a(5) =102a(6) =200a(7) =201a(8) =204a(9) =207a(10) =210a(11) =240a(12) =270a(13) =402a(14) =420a(15) =600a(16) =702a(17) =1000a(18) =1002a(19) =1020a(20) =1200a(21) =2000a(22) =2001a(23) =2004a(24) =2007a(25) =2010a(26) =2040a(27) =2070a(28) =2100a(29) =2400