Products of the digits of e excluding 0.

Terms

a(0) =2a(1) =14a(2) =14a(3) =112a(4) =224a(5) =1792a(6) =1792a(7) =14336a(8) =28672a(9) =229376a(10) =917504a(11) =4587520a(12) =41287680a(13) =165150720a(14) =825753600a(15) =1651507200a(16) =4954521600a(17) =24772608000a(18) =74317824000a(19) =445906944000a(20) =891813888000