A025222 a(n) = [ Sum{(sqrt(j+1)-sqrt(i+1))^2} ], 1 <= i < j <= n.

0, 0, 1, 3, 6, 10, 16, 25, 35, 48, 65, 84, 108, 135, 166, 203, 244, 290, 342, 400, 464, 535, 613, 698, 790, 890, 999, 1116, 1242, 1377, 1522, 1677, 1842, 2017, 2203, 2401, 2610, 2831, 3064, 3309, 3568, 3839, 4125, 4423, 4737, 5064, 5407, 5764, 6138, 6527, 6932, 7353, 7792, 8248

Offset

1,4

Links

Table of n, a(n) for n=1..54.

Crossrefs

Sequence in context: A078663 A173691 A280709 * A011902 A025004 A145131

Adjacent sequences: A025219 A025220 A025221 * A025223 A025224 A025225

Keyword

nonn

Author

Clark Kimberling

Extensions

890 inserted by Neven Juric (neven.juric(AT)apis-it.hr), Jul 13 2005

Status

approved