A023664 Convolution of the lower and upper Wythoff sequences (A000201 and A001950).

2, 11, 30, 63, 117, 194, 298, 434, 604, 816, 1072, 1375, 1735, 2151, 2628, 3172, 3783, 4471, 5237, 6083, 7019, 8042, 9162, 10382, 11702, 13136, 14680, 16339, 18122, 20025, 22061, 24230, 26532, 28985, 31580, 34325, 37228, 40284, 43509, 46900

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A000201, A001950.

Programs

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

Extensions

Missing a(13) = 1735 inserted by Sean A. Irvine, Jun 09 2019