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A289652
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Catalan numbers - 2 (A120304) with first three terms changed to 1,1,1.
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7
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1, 1, 1, 3, 12, 40, 130, 427, 1428, 4860, 16794, 58784, 208010, 742898, 2674438, 9694843, 35357668, 129644788, 477638698, 1767263188, 6564120418, 24466267018, 91482563638, 343059613648, 1289904147322, 4861946401450, 18367353072150, 69533550916002, 263747951750358
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listen;
history;
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internal format)
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OFFSET
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1,4
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COMMENTS
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Related to number of mesh patterns of length 2 that avoid the pattern 321.
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LINKS
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MATHEMATICA
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Join[{1, 1, 1}, CatalanNumber[Range[3, 30]]-2] (* Paolo Xausa, Dec 08 2023 *)
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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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