Search: id:A064276
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%I A064276
%S A064276 1,5,13,25,42,62,90,118,155,195,243,287,352,404,472,548,629,697,797,
%T A064276 873,986,1094,1202,1294,1443,1559,1687,1823,1984,2100,2296,2420,2597,
%U A064276 2769,2937,3125,3366,3514,3702,3906,4167,4331,4611,4783,5040,5320,5548
%N A064276 Number of 2 X 2 singular integer matrices with elements from {0,...,n} 
               up to row and column permutation.
%F A064276 a(n) = (A059306(n)+(n+1)*(2*n+3))/4.
%e A064276 There are 5 binary singular matrices up to row and column permutation:
%e A064276 [0 0] [1 0] [1 1] [1 0] [1 1]
%e A064276 [0 0] [0 0] [0 0] [1 0] [1 1].
%Y A064276 Cf. A059306, A062801, A059976.
%Y A064276 Sequence in context: A098483 A147205 A146875 this_sequence A102724 A147031 
               A147220
%Y A064276 Adjacent sequences: A064273 A064274 A064275 this_sequence A064277 A064278 
               A064279
%K A064276 nonn
%O A064276 0,2
%A A064276 Vladeta Jovovic (vladeta(AT)eunet.rs), Sep 24 2001
%E A064276 More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 16 
               2002

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