A336878 Second differences of A336877, divided by 3.

1, 1, 2, 1, 1, 2, 5, 1, -2, 1, 5, 2, 1, 5, 14, 1, -11, -2, 5, 1, -2, 5, 17, 2, -11, 1, 14, 5, 1, 14, 41, 1, -38, -11, 5, -2, -11, 5, 26, 1, -23, -2, 17, 5, -2, 17, 53, 2, -47, -11, 14, 1, -11, 14, 53, 5, -38, 1, 41, 14, 1, 41, 122, 1, -119, -38, 5, -11, -38, 5

Offset: 1

Author

Andrey Zabolotskiy, Aug 06 2020

Keywords

• sign

Links

• Andrey Zabolotskiy, Table of n, a(n) for n = 1..8191
• A. A. Kirillov, A Tale of Two Fractals, Birkhäuser, 2013, doi:10.1007/978-0-8176-8382-5. See chapter 3, in particular Table 3.1.

Crossrefs

Cf. A336877.

Formula

a(n) = (b(n+1) - 2*b(n) + b(n-1)) / 3, where b(n) = A336877(n).

a(2*n) = a(n), a(2*n-1) + a(2*n+1) = 3*a(n).