%I A056205
%S A056205 1,1,7,23,153,849,6128,43534,319119,2255466,15307395,98349144,
%T A056205 597543497,3430839916,18653684881,96273409815,473010823993,
%U A056205 2218614773950,9961651259869,42927432229913,177963663264430
%N A056205 Number of n X 6 binary matrices under row and column permutations and 
               column complementations.
%D A056205 M. A. Harrison, On the number of classes of binary matrices, IEEE Trans.Computers, 
               22 (1973), 1048-1051.
%F A056205 G.f.: 1/46080*(1/(1 - x^1)^64 + 1053/(1 - x^2)^32 + 30/(1 - x^1)^32/(1 
               - x^2)^16 + 4920/(1 - x^4)^16 + 180/(1 - x^1)^16/(1 - x^2)^24 + 120/
               (1 - x^1)^8/(1 - x^2)^28 + 160/(1 - x^1)^16/(1 - x^3)^16 + 5280/(1 
               - x^2)^8/(1 - x^6)^8 + 960/(1 - x^1)^8/(1 - x^2)^4/(1 - x^3)^8/(1 
               - x^6)^4 + 3840/(1 - x^4)^4/(1 - x^12)^4 + 640/(1 - x^1)^4/(1 - x^3)^20 
               + 1920/(1 - x^2)^2/(1 - x^6)^10 + 720/(1 - x^1)^8/(1 - x^2)^4/(1 
               - x^4)^12 + 5760/(1 - x^8)^8 + 2160/(1 - x^2)^8/(1 - x^4)^12 + 1440/
               (1 - x^1)^4/(1 - x^2)^6/(1 - x^4)^12 + 2304/(1 - x^1)^4/(1 - x^5)^12 
               + 6912/(1 - x^2)^2/(1 - x^10)^6 + 3840/(1 - x^1)^2/(1 - x^2)^1/(1 
               - x^3)^2/(1 - x^6)^9 + 3840/(1 - x^4)^1/(1 - x^12)^5).
%Y A056205 Cf. A005232, A006380-A006382, A002727, A006148, A052264.
%Y A056205 Sequence in context: A082021 A080082 A158954 this_sequence A099051 A034192 
               A050918
%Y A056205 Adjacent sequences: A056202 A056203 A056204 this_sequence A056206 A056207 
               A056208
%K A056205 nonn
%O A056205 0,3
%A A056205 Vladeta Jovovic (vladeta(AT)eunet.rs), Aug 05 2000