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

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