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Convolution of the lower and upper Wythoff sequences (A000201 and A001950).
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%I #17 Jun 16 2019 17:52:30

%S 2,11,30,63,117,194,298,434,604,816,1072,1375,1735,2151,2628,3172,

%T 3783,4471,5237,6083,7019,8042,9162,10382,11702,13136,14680,16339,

%U 18122,20025,22061,24230,26532,28985,31580,34325,37228,40284,43509,46900

%N Convolution of the lower and upper Wythoff sequences (A000201 and A001950).

%o (PARI) a(n) = my(phi = (1+sqrt(5))/2); sum(k=1, n, floor(k*phi)*floor((n-k+1)*phi^2)); \\ _Michel Marcus_, Jun 10 2019

%Y Cf. A000201, A001950.

%K nonn

%O 1,1

%A _Clark Kimberling_

%E Missing a(13) = 1735 inserted by _Sean A. Irvine_, Jun 09 2019