%I A050478
%S A050478 1,9,34,125,462,1722,6468,24453,92950,354926,1360476,5231954,20177164,
%T A050478 78004500,302211720,1173076245,4561139430,17761336230,69257611500,
%U A050478 270391268070,1056823387620
%N A050478 C(n)*(8n+1) where C(n)=Catalan numbers (A000108).
%D A050478 A. H. Beiler, Recreations in the Theory of Numbers, Dover, N.Y., 1964, 
               pps. 194-196.
%Y A050478 Cf. A016993, A000108 and A051945.
%Y A050478 Sequence in context: A067989 A002881 A005344 this_sequence A154393 A119389 
               A067960
%Y A050478 Adjacent sequences: A050475 A050476 A050477 this_sequence A050479 A050480 
               A050481
%K A050478 easy,nonn
%O A050478 0,2
%A A050478 Barry E. Williams, Dec 24 1999