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A290444
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a(n) = Bell(n)*Motzkin(n).
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2
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1, 1, 4, 20, 135, 1092, 10353, 111379, 1337220, 17657745, 253753300, 3934348860, 65357103067, 1156505021895, 21692653556148, 429508201237740, 8944455477773649, 195294184991801316, 4458314558395176738, 106151731888618579188, 2630277877344143416068, 67691533135923616420809
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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motzkin[n_]:=Hypergeometric2F1[(1-n)/2, -n/2, 2, 4]; Table[BellB[n] motzkin[n], {n, 0, 50}] (* Indranil Ghosh, Aug 04 2017 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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