A303028 a(0) = 0, a(1) = a(2) = 1; for k >= 2, a(2*k-1) = k - 1 - a(k-1) - a(k), a(2*k) = a(2*k-1) - a(k).

0, 1, 1, -1, -2, 2, 3, 6, 8, 4, 2, 0, -3, -3, -9, -7, -15, -4, -8, 3, 1, 8, 8, 14, 17, 18, 21, 25, 34, 30, 37, 37, 52, 35, 39, 29, 37, 23, 20, 15, 14, 11, 3, 5, -3, 0, -14, -8, -25, -11, -29, -14, -35, -20, -45, -32, -66, -36, -66, -38, -75, -44, -81, -58, -110, -55, -90, -41, -80, -34, -63, -31, -68, -24, -47, -6, -26, 3

Offset

0,5

Links

Altug Alkan, Table of n, a(n) for n = 0..11000

Altug Alkan, A scatterplot of first differences of a(n)

Rémy Sigrist, Density plot of the first 11000000 terms

Prog

(PARI) a = vector(77); print1 (0", "); for (k=1, #a, print1 (a[k]=if (k<=2, 1, my (n=k\2); if (k%2==0, a[2*n-1]-a[n], n-a[n]-a[n+1]))", ")) \\ Rémy Sigrist, Aug 16 2018

Crossrefs

Cf. A002487, A330328 (first differences).

Sequence in context: A298436 A228577 A032062 * A011141 A159915 A007801

Adjacent sequences: A303025 A303026 A303027 * A303029 A303030 A303031

Keyword

sign,look,hear

Author

Altug Alkan, Aug 16 2018

Status

approved