%I #10 Mar 29 2020 10:39:24
%S 0,1,2,3,5,7,9,12,17,20,24,28,34,37,44,49,56,63,73,79,87,94,105,110,
%T 122,132,144,153,166,177,187,199,215,225,243,252,271,282,300,314,328,
%U 343,364,379,399,413,435,448,471,490,513,530,554,572,594,613,640,657
%N a(n) = A333572(n)/4.
%H Robert Israel, <a href="/A333573/b333573.txt">Table of n, a(n) for n = 1..2000</a>
%Y Cf. A004018, A232705, A333462, A333572.
%K nonn
%O 1,3
%A _Hugo Pfoertner_, Mar 27 2020