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%I #2 Mar 30 2012 17:34:03
%S 0,1,2,3,4,8,12,13,14,16,18,21,24,31,38,39,40,42,44,47,50,54,58,63,68,
%T 78,88,89,90,92,94,97,100,104,108,113,118,124,130,137,144,157,170,171,
%U 172,174,176,179,182,186,190,195,200,206,212
%N A polyspiral path: a(n) represents the n-th vertex of a lattice path with an infinite number of finite square spirals.
%C Note that the vertex 0 and the vertex 4 both are overlapping.
%C For other versions see A171165 and A171166.
%C Also, partial sums of the sequence formed by 0 together with the numbers of A171172 repeated.
%Y Cf. A171165, A171166, A171172, A171173, A171174, A171175, A171176, A171177, A171178.
%K easy,nonn
%O 0,3
%A _Omar E. Pol_, Mar 14 2010