A274094 - OEIS

A274094

a(0)=0; thereafter (-1)^(n+1)*n appears n times.

0, 1, -2, -2, 3, 3, 3, -4, -4, -4, -4, 5, 5, 5, 5, 5, -6, -6, -6, -6, -6, -6, 7, 7, 7, 7, 7, 7, 7, -8, -8, -8, -8, -8, -8, -8, -8, 9, 9, 9, 9, 9, 9, 9, 9, 9, -10, -10, -10, -10, -10, -10, -10, -10, -10, -10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, -12, -12, -12, -12, -12, -12, -12, -12, -12, -12

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Chai Wah Wu, Table of n, a(n) for n = 0..10011

MAPLE

s1:=[0];

for n from 1 to 15 do

for i from 1 to n do

s1:=[op(s1), (-1)^(n+1)*n]; od: od:

s1;

MATHEMATICA