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Permutation of N: a(n)+C(k,2), where a=A054073 and k=Floor((1+sqrt(8n-3))/2).
4

%I #4 Mar 30 2012 18:57:01

%S 1,2,3,6,4,5,9,7,10,8,15,13,11,14,12,20,18,16,21,19,17,26,24,22,27,25,

%T 23,28,33,31,36,29,34,32,30,35,41,39,44,37,42,40,45,38,43,50,55,48,53,

%U 46,51,49,54,47,52,60,65,58,63,56,61,66,59

%N Permutation of N: a(n)+C(k,2), where a=A054073 and k=Floor((1+sqrt(8n-3))/2).

%e Referring to A054073, just add C(k,2) to the numbers in p(k); e.g. p(1)=1->(1); p(2)=(1,2)->(2,3); p(3)=(3,1,2)->(6,4,5).

%K nonn

%O 1,2

%A _Clark Kimberling_