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%I #11 Dec 19 2014 14:17:05
%S 1,1,2,2,2,2,2,2,3,3,3,3,3,3,5,5,5,5,5,5,5,6,8,8,8,8,8,8,8,9,9,9,9,9,
%T 9,9,9,9,9,9,9,9,11,11,11,11,11,11,11,11,14,14,14,14,14,14,14,14,14,
%U 14,15,18,18,18,18,18
%N a(n) = (A251549(n)-1)/2.
%H Chai Wah Wu, <a href="/A251550/b251550.txt">Table of n, a(n) for n = 1..10000</a>
%o (Haskell)
%o a251550 = flip div 2 . subtract 1 . a251549
%o -- _Reinhard Zumkeller_, Dec 19 2014
%Y Cf. A098550, A247253, A251416, A251417, A251546-A251552.
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Dec 18 2014