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Number of (odd and even) split numbers (A036382) below 2^n.
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%I #19 Feb 19 2021 10:40:49

%S 0,0,1,4,12,30,69,150,317,659,1361,2784,5686,11557,23445,47472,95991,

%T 193891,391266,788979,1589856,3201863,6445059,12967425,26080302,

%U 52434693,105386552,211751544,425359720,854245385,1715204991

%N Number of (odd and even) split numbers (A036382) below 2^n.

%C Equivalently, number of split numbers (A036382) with binary order (A029837) <= n.

%C Partial sums of A036385. - _Sean A. Irvine_, Oct 29 2020

%e The 12 odd and even split numbers below 32 are as follows: 6, 10, 12, 14, 18, 20, 21, 22, 24, 26, 28, 30.

%Y Cf. A029837 (ceiling(log_2(n))), A036382.

%K nonn,more

%O 1,4

%A _Labos Elemer_

%E Definition rephrased by _M. F. Hasler_, Apr 24 2017

%E a(21)-a(31) from _Sean A. Irvine_, Oct 29 2020