%I A048642
%S A048642 1,1,3,6,36,252,1260,5040,60480,786240,11793600,165110400,1651104000,
%T A048642 18162144000,163459296000,1307674368000,31384184832000,784604620800000,
%U A048642 21184324761600000,550792443801600000,16523773314048000000
%N A048642 Partial products of A003188 (Gray code).
%F A048642 a(0) = 1, a(n) = product(XORnos(j, floor(j/2)), j=1..n)
%Y A048642 a((2^n)-1) = A000142[ (2^n)-1 ] for all n.
%Y A048642 Sequence in context: A068084 A003674 A120595 this_sequence A077532 A093800 
               A068776
%Y A048642 Adjacent sequences: A048639 A048640 A048641 this_sequence A048643 A048644 
               A048645
%K A048642 easy,nonn
%O A048642 0,3
%A A048642 Antti Karttunen, Jul 14 1999