Product of the even divisors of n.

Terms

a(0) =1a(1) =2a(2) =1a(3) =8a(4) =1a(5) =12a(6) =1a(7) =64a(8) =1a(9) =20a(10) =1a(11) =576a(12) =1a(13) =28a(14) =1a(15) =1024a(16) =1a(17) =216a(18) =1a(19) =1600a(20) =1a(21) =44a(22) =1a(23) =110592a(24) =1a(25) =52a(26) =1a(27) =3136a(28) =1a(29) =3600