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

Author

Rémy Sigrist, Dec 12 2019

Keywords

• nonn
• look

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

Crossrefs

Cf. A000290, A330385.

Programs

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)))

Formula

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