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