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A046912
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Number of irreducible quasiorders with n labeled points.
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2
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1, 1, 2, 11, 147, 3412, 121553, 6353629, 476850636, 50811255045, 7636459252135, 1610584897516674, 474333338553730879, 194055026319667963777, 109692570582311591696890, 85221064877720762475072503, 90542406571528792666541430863, 130936936785995060562730057163556, 256634185641525450158992588551158389
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OFFSET
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0,3
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LINKS
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FORMULA
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MATHEMATICA
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A000798 = Cases[Import["https://oeis.org/A000798/b000798.txt", "Table"], {_, _}][[All, 2]]; lg = Length[A000798];
B[x_] = Sum[A000798[[n + 1]] x^n/n!, {n, 0, lg - 1}];
A[x_] = 2 - 1/B[x];
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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John A. Wright.
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EXTENSIONS
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STATUS
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approved
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