%I #11 Mar 24 2020 03:24:05

%S 2,2,3,3,7,5,7,2,17,7,11,5,11,13,5,3,241,17,29,7,17,31,43,13,43,11,17,

%T 13,29,193,11,2,13,11,37,73,67,29,41,7,23,97,79,31,73,29,19,5,37,43,

%U 73,31,157,17,23,13,41,43,199,17,19,11,7

%N The numerators of the fractions in the Schinzel-Sierpiński tree A295511, read across levels. Also an encoding of Stern's diatomic series A002487.

%e The triangle (row lengths are 2^(n-1)) starts:

%e 1: 2

%e 2: 2, 3

%e 3: 3, 7, 5, 7

%e 4: 2, 17, 7, 11, 5, 11, 13, 5

%e 5: 3, 241, 17, 29, 7, 17, 31, 43, 13, 43, 11, 17, 13, 29, 193, 11

%o (Sage) # uses[SSETree from A295511]

%o def A295510_row(n):

%o if n == 1: return [2]

%o return [r.numerator() for r in SSETree(n)]

%o for n in (1..6): print(A295510_row(n))

%Y Cf. A002487, A295510, A295512.

%K nonn,tabf

%O 1,1

%A _Peter Luschny_, Nov 23 2017