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A109743
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a(2)=1; for n>2, a(n) = A109742(n)/3.
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1
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1, 3, 9, 41, 231, 1551, 12037, 105861, 1039539, 11268059, 133585089, 1718984673, 23857531519, 355190381031, 5646040979901, 95432906354621, 1709068974897867, 32325104169244851, 643869687410800249, 13471540400560532889, 295384662114697463319
(list; graph; refs; listen; history; internal format)
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