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%I #5 Nov 21 2013 12:49:09
%S 1,2,1094,2899,56817,155286,3268191,9099642,12834909238,36503886401,
%T 57494353262135,165465534734914,278352404864419302,807141068080455861,
%U 19766110689810556002,57478249717507080819,1418604378354657012789
%N Even Motzkin numbers divided by 2.
%D E. Deutsch and B. E. Sagan, Congruences for Catalan and Motzkin numbers and related sequences, J. Num. Theory 117 (2006), 191-215.
%F a(n)=A134718(n)/2.
%t #/2&/@Select[Rest[RecurrenceTable[{a[0]==a[1]==1,a[n]==(3(n-1)a[n-2]+ (2n+1)a[n-1])/(n+2)},a,{n,60}]],EvenQ] (* _Harvey P. Dale_, Feb 27 2012 *)
%Y Cf. A001006, A134718.
%K nonn
%O 1,2
%A _Omar E. Pol_, Feb 17 2008
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