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%I #17 Nov 17 2022 05:27:10
%S 1,1,6,1,6,6,36,1,6,6,36,6,36,36,216,1,6,6,36,6,36,36,216,6,36,36,216,
%T 36,216,216,1296,1,6,6,36,6,36,36,216,6,36,36,216,36,216,216,1296,6,
%U 36,36,216,36,216,216,1296,36,216,216,1296,216,1296,1296,7776,1,6,6,36,6,36,36
%N a(n) = 6^(wt(n) - 1) where wt(n) = A000120(n).
%e From _Omar E. Pol_, Jul 21 2009: (Start)
%e If written as a triangle:
%e 1;
%e 1,6;
%e 1,6,6,36;
%e 1,6,6,36,6,36,36,216;
%e 1,6,6,36,6,36,36,216,6,36,36,216,36,216,216,1296;
%e 1,6,6,36,6,36,36,216,6,36,36,216,36,216,216,1296,6,36,36,216,36,216,216,...
%e (End)
%o (Python 3.10+)
%o def A151784(n): return 6**(n.bit_count()-1) # _Chai Wah Wu_, Nov 15 2022
%o (PARI) a(n) = 6^(hammingweight(n)-1); \\ _Michel Marcus_, Nov 15 2022
%Y Cf. A000120, A048881, A048896, A147610, A151780, A151783, A000120.
%Y Cf. A000400. - _Omar E. Pol_, Jul 21 2009
%K nonn
%O 1,3
%A _N. J. A. Sloane_, Jun 25 2009
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