%I
%S 1,2,2,3,7,12,25,50,101,153,331,675,1355,2714,5429,10858,21717,32577,
%T 70583,143881,289121,578922,1158188,2316554,4633160,9266371,18532767,
%U 37065547,74131099,148262202,296524405,593048810,1186097621
%N a(n) = a(1) + a(2) + ... + a(n1)  a(m) for n >= 3, where m = 2^(p+1) + 2  n and p is the unique number such that 2^p < n  1 <= 2^(p+1), starting with a(1) = 1 and a(2) = 2.
%p s := proc(n) option remember; `if`(n < 1, 0, a(n) + s(n  1)) end proc:
%p a := proc(n) option remember;
%p `if`(n < 3, [1, 2][n], s(n  1)  a(2^ceil(log[2](n  1)) + 2  n)):
%p end proc:
%p seq(a(n), n = 1..34); # _Petros Hadjicostas_, Nov 11 2019
%K nonn
%O 1,2
%A _Clark Kimberling_
%E Name edited by _Petros Hadjicostas_, Nov 11 2019
