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 A135618 Even Motzkin numbers divided by 2. 0
 1, 2, 1094, 2899, 56817, 155286, 3268191, 9099642, 12834909238, 36503886401, 57494353262135, 165465534734914, 278352404864419302, 807141068080455861, 19766110689810556002, 57478249717507080819, 1418604378354657012789 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 REFERENCES E. Deutsch and B. E. Sagan, Congruences for Catalan and Motzkin numbers and related sequences, J. Num. Theory 117 (2006), 191-215. LINKS FORMULA a(n)=A134718(n)/2. MATHEMATICA #/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] (* From Harvey P. Dale, Feb 27 2012 *) CROSSREFS Cf. A001006, A134718. Sequence in context: A108963 A152510 A039951 * A119554 A036104 A036106 Adjacent sequences:  A135615 A135616 A135617 * A135619 A135620 A135621 KEYWORD nonn AUTHOR Omar E. Pol, Feb 17 2008 STATUS approved

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