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%I #13 Apr 09 2015 11:10:19
%S 0,1,5,21,22,53,15,7,29,711,541,671,12,742,782,33,673,524,774,235,95,
%T 156,517,287,258,529,1001,801,2611,7421,5331,6241,251,7161,7171,281,
%U 6291,5302,7412,2622,832,1052,5262,2572,2882,5103,1513,923,2343,7753,5273
%N Pentagonal numbers written backwards.
%H Alois P. Heinz, <a href="/A004163/b004163.txt">Table of n, a(n) for n = 0..10000</a>
%F a(n) = A004086(A000326(n)). - _Michel Marcus_, Apr 05 2014
%p a:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||(n*(3*n-1)/2)):
%p seq(a(n), n=0..50); # _Alois P. Heinz_, Apr 09 2015
%Y Cf. A000326.
%K nonn,base
%O 0,3
%A _N. J. A. Sloane_
%E Initial 0 and terms after a(43) from _Eric M. Schmidt_, Apr 04 2014
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