A025216 [ Sum (s(j) - s(i))^2 ], 1 <= i < j <= n, where s(k) = 1 + 1/2 + ... + 1/k.

0, 1, 2, 5, 8, 13, 19, 26, 34, 44, 56, 68, 82, 98, 115, 134, 154, 176, 200, 225, 251, 280, 310, 341, 375, 410, 446, 485, 525, 566, 610, 655, 702, 751, 801, 853, 907, 963, 1020, 1079, 1140, 1203, 1267, 1334, 1402, 1472, 1543, 1617, 1692, 1769, 1848, 1929, 2011, 2095, 2182, 2270

Offset

2,3

Links

Table of n, a(n) for n=2..57.

Crossrefs

Sequence in context: A111097 A027916 A054254 * A076059 A299732 A169952

Adjacent sequences: A025213 A025214 A025215 * A025217 A025218 A025219

Keyword

nonn

Author

Clark Kimberling

Status

approved