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a(n) = A186434(n)/4.
3

%I #20 Feb 20 2017 12:11:36

%S 0,1,9,37,111,266,550,1006,1744,2821,4349,6405,9203,12804,17418,23164,

%T 30348,39023,49591,62073,76997,94454,114768,138054,165176,196019,

%U 231085,270557,315283,365102,421116,482950,552092,628401,712437,804509,906217,1016724,1137140,1267836,1410790,1564903

%N a(n) = A186434(n)/4.

%C It would be nice to have a formula.

%H Lars Blomberg, <a href="/A271908/b271908.txt">Table of n, a(n) for n = 1..10000</a>

%Y Cf. A186434.

%K nonn

%O 1,3

%A _N. J. A. Sloane_, Apr 22 2016