%I A028928
%S A028928 1,0,0,2,0,2,2,0,0,0,2,0,2,2,0,0,0,0,0,2,2,2,0,0,2,0,2,4,0,0,0,0,0,
%T A028928 0,0,2,0,0,2,0,2,0,2,0,0,6,0,0,2,0,0,0,2,0,4,0,0,0,0,2,0,2,0,0,0,0,
%U A028928 0,0,0,4,2,0,0,0,0,6,2,0,0,0,2,0,0,2,2,0,0,0,0,0,6,2,0,0,0,0,2,0,0
%N A028928 Theta series of quadratic form (or lattice) with Gram matrix [ 3, 1; 
               1, 5 ].
%H A028928 John Cannon, <a href="b028928.txt">Table of n, a(n) for n = 0..10000</
               a>
%H A028928 Michael Gilleland, <a href="selfsimilar.html">Some Self-Similar Integer 
               Sequences</a>
%e A028928 1 + 2*q^3 + 2*q^5 + 2*q^6 + 2*q^10 + 2*q^12 + 2*q^13 + 2*q^19 + 2*q^20 
               + 2*q^21 + 2*q^24 + 2*q^26 + 4*q^27 + 2*q^35 + 2*q^38 + 2*q^40 + 
               2*q^42 + 6*q^45 + ...
%Y A028928 Sequence in context: A036997 A116900 A160210 this_sequence A091379 A151758 
               A164272
%Y A028928 Adjacent sequences: A028925 A028926 A028927 this_sequence A028929 A028930 
               A028931
%K A028928 nonn
%O A028928 0,4
%A A028928 N. J. A. Sloane (njas(AT)research.att.com).