%I A053601
%S A053601 1,1,3,28,840,83328,27998208,32509919232,132640470466560,
%T A053601 1927943976061501440,100981078400558897823744,
%U A053601 19242660536873338307044442112,13448310596010038676027219703234560
%N A053601 Bases of n-dimensional vector space over GF(2).
%F A053601 a(n) = (2^n-1)(2^n-2)...(2^n-2^(n-1))/n!.
%e A053601 a(2)=3 because the 3 bases are {01,10}, {01,11}, {10,11}.
%Y A053601 Cf. A002884.
%Y A053601 Sequence in context: A084880 A110259 A015474 this_sequence A140990 A122891 
               A119156
%Y A053601 Adjacent sequences: A053598 A053599 A053600 this_sequence A053602 A053603 
               A053604
%K A053601 easy,nonn
%O A053601 0,3
%A A053601 Fred Galvin (galvin(AT)math.ukans.edu), Jan 20 2000
%E A053601 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 05 2000