Voozh

A330386

Running totals in A330385.

1, 4, 0, 9, 16, 4, 9, 1, 16, 0, 25, 36, 49, 25, 64, 81, 100, 121, 144, 100, 64, 36, 16, 49, 9, 36, 4, 49, 1, 36, 121, 49, 100, 36, 169, 256, 196, 225, 256, 361, 484, 400, 441, 484, 625, 529, 576, 625, 784, 841, 900, 961, 1024, 1089, 1156, 1225, 1296, 1369

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

OFFSET

1,2

COMMENTS

All terms are nonnegative squares.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, Scatterplot of the first 5000000 terms

FORMULA

a(n) = - Sum_{k = 1..n } A330385(k) * (-1)^A330385(k).

PROG

(PARI) s=t=0; for (n=1, 58, for (v=1, oo, if (!bittest(s, v) && issquare(u=t-v*(-1)^v), print1 (t=u ", "); s+=2^v; break)))