%I A004161
%S A004161 1,4,1,2,53,65,48,21,561,22,682,463,554,65,86,618,969,411,
%T A004161 331,451,1771,4202,32,62,5292,6723,4563,604,5944,694,6545,
%U A004161 4895
%N A004161 Tetrahedral numbers written backwards.
%Y A004161 Cf. A000292.
%Y A004161 Sequence in context: A030441 A072033 A159766 this_sequence A025016 A094244 
               A075447
%Y A004161 Adjacent sequences: A004158 A004159 A004160 this_sequence A004162 A004163 
               A004164
%K A004161 nonn,base
%O A004161 1,2
%A A004161 N. J. A. Sloane (njas(AT)research.att.com).