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A370966
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a(n) = number of max-closed 2 X 2 X n relations.
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1
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1, 14, 122, 898, 6086, 39394, 248102, 1536178, 9409046, 57227074, 346467782, 2091269458, 12597590006, 75785795554, 455516874662, 2736312874738, 16430733386966, 98635853704834, 592021022116742, 3552949991056018, 21320996155647926, 127939164097754914, 767687740219762022
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = 35/6*6^n - 6*4^n + 2/3*3^n + 1/2*2^n.
G.f.: (1-z)*(1-8*z^2) / ((1-6*z)*(1-4*z)*(1-3*z)*(1-2*z)). (End)
E.g.f.: exp(2*x)*(3 + 4*exp(x) - 36*exp(2*x) + 35*exp(4*x)). - Stefano Spezia, Aug 20 2024
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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