cp's OEIS Frontend

A246148 Number of inequivalent n X 3 binary matrices, where equivalence means permutations of rows or columns or the symbol set.

%I A246148 #10 May 02 2022 09:42:13
%S A246148 1,2,8,18,47,95,200,367,674,1142,1914,3040,4765,7189,10702,15487,
%T A246148 22135,30949,42794,58143,78216,103723,136338,177081,228201,291119,
%U A246148 368790,463149,578011,715946,881810,1078952,1313462,1589639,1915028,2295059,2738985,3253576
%N A246148 Number of inequivalent n X 3 binary matrices, where equivalence means permutations of rows or columns or the symbol set.
%H A246148 Alois P. Heinz, <a href="/A246148/b246148.txt">Table of n, a(n) for n = 0..1000</a>
%H A246148 <a href="/index/Mat#inequiv">Index to number of inequivalent matrices modulo permutation of rows and columns</a>
%F A246148 G.f.: (x^10 -x^9 +2*x^8 +x^7 +4*x^6 -2*x^5 +4*x^4 +x^3 +2*x^2 -x +1)/ ((x^2-x+1) *(x^2+x+1)^2 *(x+1)^4 *(x-1)^8).
%p A246148 a:= n-> coeff(series((x^10-x^9+2*x^8+x^7+4*x^6-2*x^5
%p A246148         +4*x^4+x^3+2*x^2-x+1)/((x^2-x+1) *(x^2+x+1)^2
%p A246148         *(x+1)^4 *(x-1)^8), x, n+1), x, n):
%p A246148 seq(a(n), n=0..50);
%Y A246148 Column k=3 of A242093.
%K A246148 nonn,easy
%O A246148 0,2
%A A246148 _Alois P. Heinz_, Aug 17 2014