a(n) = A062402(2^n-1).

Terms

a(0) =1a(1) =3a(2) =12a(3) =15a(4) =72a(5) =91a(6) =312a(7) =255a(8) =1240a(9) =1860a(10) =4123a(11) =5080a(12) =26208a(13) =34200a(14) =93600a(15) =65535a(16) =334368a(17) =416560a(18) =1420800a(19) =1596364a(20) =6146800a(21) =5949696a(22) =20485332a(23) =23788842a(24) =120519630a(25) =194016600a(26) =358132380a(27) =458803800a(28) =1674738000a(29) =2166798816