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a(n) = A209973(n)/4.
1

%I #11 Jun 28 2021 08:54:41

%S 0,0,3,5,9,13,19,25,33,39,51,61,69,81,99,107,123,139,157,175,191,203,

%T 233,255,271,291,327,345,369,397,421,451,483,503,551,575,599,635,689,

%U 713,745,785,821,863,903,927,993,1039,1071,1113,1173

%N a(n) = A209973(n)/4.

%C For a guide to related sequences, see A210000.

%F Apparently, a(n) = a(n-1) + 2*A126246(n) - A000010(n) for n >= 2. - _Pontus von Brömssen_, Jun 28 2021

%t (See the Mathematica section at A210000.)

%Y Cf. A210000.

%Y Cf. A000010, A126246.

%K nonn

%O 0,3

%A _Clark Kimberling_, Mar 16 2012