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Product_{k=1..n} b(k), where b(k) = binary expansion of k (A007088) but read as if it were a decimal number.
1

%I #6 Mar 31 2012 20:55:18

%S 1,1,10,110,11000,1111000,122210000,13565310000,13565310000000,

%T 13578875310000000,13714664063100000000,13865525367794100000000,

%U 15252077904573510000000000,16792537772935434510000000000,18639716927958332306100000000000,20708725506961707192077100000000000

%N Product_{k=1..n} b(k), where b(k) = binary expansion of k (A007088) but read as if it were a decimal number.

%e a(4) = 1*10*11*100 = 11000.

%Y Partial products of A007088.

%K nonn,base,easy

%O 0,3

%A _Susanna Cuyler_, May 23 2003