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A350451
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Number of weakly connected acyclic digraphs with n arcs.
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6
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1, 1, 3, 9, 36, 151, 750, 3959, 22857, 140031, 909388, 6202031, 44256875, 328994157, 2540242646, 20317980102, 167980915848, 1432808198569, 12587788263807, 113739153822878, 1055610955120803, 10051265993496814, 98083750658261085, 979961276867802001, 10015362142357613001
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OFFSET
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0,3
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LINKS
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PROG
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(PARI) \\ See PARI link in A122078 for program code.
{ my(T=WeakAcyclicDigraphsTr(15)); vector(#T, n, vecsum(T[n])) }
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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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