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A326174 Number of subsets of {1..n} containing n whose sum is greater than or equal to the sum of their complement. 7

%I #14 Oct 16 2020 19:30:07

%S 1,2,4,7,13,25,50,98,186,366,739,1457,2822,5589,11258,22304,43629,

%T 86658,174257,346180,680955,1354829,2721296,5414787,10689261,21290468,

%U 42730228,85112982,168430866,335726276,673421519,1342347992,2661053796,5307062034,10640664164

%N Number of subsets of {1..n} containing n whose sum is greater than or equal to the sum of their complement.

%H Fausto A. C. Cariboni, <a href="/A326174/b326174.txt">Table of n, a(n) for n = 1..46</a>

%e The a(1) = 1 through a(5) = 13 subsets:

%e {1} {2} {3} {1,4} {3,5}

%e {1,2} {1,3} {2,4} {4,5}

%e {2,3} {3,4} {1,2,5}

%e {1,2,3} {1,2,4} {1,3,5}

%e {1,3,4} {1,4,5}

%e {2,3,4} {2,3,5}

%e {1,2,3,4} {2,4,5}

%e {3,4,5}

%e {1,2,3,5}

%e {1,2,4,5}

%e {1,3,4,5}

%e {2,3,4,5}

%e {1,2,3,4,5}

%t Table[Length[Select[Subsets[Range[n]],MemberQ[#,n]&&Plus@@#>=Plus@@Complement[Range[n],#]&]],{n,10}]

%Y Cf. A053632, A057567, A057568, A059529, A063865, A326152, A326173, A326175.

%K nonn

%O 1,2

%A _Gus Wiseman_, Jun 11 2019

%E a(21)-a(42) from _Bert Dobbelaere_, Jun 22 2019

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Last modified April 27 13:14 EDT 2024. Contains 372019 sequences. (Running on oeis4.)