A004096 - OEIS

%I #22 Sep 08 2022 08:44:32

%S 1,1,2,5,41,24,231,924,341,2684,69761,68785,210802,9247,444762,

%T 5484969,7675353,97446921,7836774,913627671,240214656,2076266442,

%U 4636528419,56316950343,4237414099821,2541046491684,25127035376381,40061905533596,63057159747362

%N Catalan numbers written backwards.

%H Alois P. Heinz, <a href="/A004096/b004096.txt">Table of n, a(n) for n = 0..1000</a>

%F a(n) = A004086(A000108(n)). - _Michel Marcus_, Apr 05 2014

%p a:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(

%p          ""||(binomial(2*n, n)/(n+1))):

%p seq(a(n), n=0..50);  # _Alois P. Heinz_, Apr 09 2015

%t FromDigits[Reverse[IntegerDigits[#]]]&/@CatalanNumber[Range[0, 40]] (* _Vincenzo Librandi_, Jan 21 2016 *)

%o (Magma) [Seqint(Reverse(Intseq(Catalan(n)))): n in [0..40]]; // _Vincenzo Librandi_, Jan 21 2016

%Y Cf. A000108.

%K nonn,base

%O 0,3

%A _N. J. A. Sloane_

%E More terms from _Eric M. Schmidt_, Apr 04 2014