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n*(n-1)/2 mod 2 + n*(n-1)/2 - n*( (n-1) mod 2 ).
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%I #9 Jun 06 2015 07:50:21

%S 0,0,4,2,10,10,22,20,36,36,56,54,78,78,106,104,136,136,172,170,210,

%T 210,254,252,300,300,352,350,406,406,466,464,528,528,596,594,666,666,

%U 742,740,820,820,904,902,990,990,1082,1080,1176,1176,1276,1274,1378

%N n*(n-1)/2 mod 2 + n*(n-1)/2 - n*( (n-1) mod 2 ).

%H Maran van Heesch, <a href="http://alexandria.tue.nl/extra1/afstversl/wsk-i/heesch2014.pdf">The multiplicative complexity of symmetric functions over a field with characteristic p</a>, Thesis, 2014; See Table 3.

%F Empirical g.f.: -2*x^3*(x^3+2*x^2-x+2) / ((x-1)^3*(x+1)^2*(x^2+1)). - _Colin Barker_, Jun 06 2015

%K nonn

%O 1,3

%A _N. J. A. Sloane_, Nov 19 2014