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Second differences of A336877, divided by 3.
2

%I #10 Aug 30 2021 17:18:00

%S 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,

%T 14,41,1,-38,-11,5,-2,-11,5,26,1,-23,-2,17,5,-2,17,53,2,-47,-11,14,1,

%U -11,14,53,5,-38,1,41,14,1,41,122,1,-119,-38,5,-11,-38,5

%N Second differences of A336877, divided by 3.

%H Andrey Zabolotskiy, <a href="/A336878/b336878.txt">Table of n, a(n) for n = 1..8191</a>

%H A. A. Kirillov, <a href="https://www.math.upenn.edu/~kirillov/MATH480-F07/tf.pdf">A Tale of Two Fractals</a>, Birkhäuser, 2013, <a href="https://doi.org/10.1007/978-0-8176-8382-5">doi:10.1007/978-0-8176-8382-5</a>. See chapter 3, in particular Table 3.1.

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

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

%Y Cf. A336877.

%K sign

%O 1,3

%A _Andrey Zabolotskiy_, Aug 06 2020