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a(n) = (A161206(n+1)-1)/2.
1

%I #6 Mar 02 2020 00:52:46

%S 0,1,3,6,10,15,21,28,34,40,49,61,76,91,105,120,130,136,145,158,175,

%T 196,221,249,276,298,322,354,395,435,469,502,520,526,535,548,565,586,

%U 611,640,669,696,729,774,831,894,955,1015,1066,1096,1120,1155,1202,1261,1332

%N a(n) = (A161206(n+1)-1)/2.

%Y Cf. A161206, A161207, A161209.

%K nonn

%O 0,3

%A _Omar E. Pol_, Jun 08 2009

%E More terms from _Jinyuan Wang_, Mar 01 2020