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%I #4 Mar 30 2012 18:51:52
%S 0,0,0,0,0,18,36,54,72,180,378,576,774,972,2970,4968,6966,8964,19962,
%T 39960,59958,79956,99954,299952,499950,699948,899946,1999944,3999942,
%U 5999940,7444438,9999936,29999934,49999932,69999930,89999928
%N a(n) = A131668(n) - (2n+1).
%C Digital sums: 9*A002266.
%K nonn,base
%O 0,6
%A _Paul Curtz_, Oct 04 2007
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