1,1

Table of n, a(n) for n=1..80.

f := proc(n, k) floor(n*(k+sqrt(k^2+4*k))/2)-floor((n-1)*(k+sqrt(k^2+4*k))/2); end; (with k=5)

Cf. A001468, A007538.

Sequence in context: A064864 A004553 A074826 * A101101 A046786 A035591

Adjacent sequences: A018243 A018244 A018245 * A018247 A018248 A018249

nonn

Jonas Wallgren

approved