First differences of A171733.

Terms

a(0) =2a(1) =0a(2) =6a(3) =24a(4) =10a(5) =96a(6) =14a(7) =240a(8) =18a(9) =480a(10) =22a(11) =840a(12) =26a(13) =1344a(14) =30a(15) =2016a(16) =34a(17) =2880a(18) =38a(19) =3960a(20) =42a(21) =5280a(22) =46a(23) =6864a(24) =50a(25) =8736a(26) =54a(27) =10920a(28) =58a(29) =13440