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A330386 Running totals in A330385. 2
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)))

CROSSREFS

Cf. A000290, A330385.

Sequence in context: A187027 A187850 A186965 * A098487 A174381 A184363

Adjacent sequences:  A330383 A330384 A330385 * A330387 A330388 A330389

KEYWORD

nonn,look

AUTHOR

Rémy Sigrist, Dec 12 2019

STATUS

approved

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Last modified October 2 08:34 EDT 2022. Contains 357191 sequences. (Running on oeis4.)