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 A144155 Bell convolution triangle, T(n,k) = A000110(n-k)*A000110(k) 1
 1, 1, 1, 2, 1, 2, 5, 2, 2, 5, 15, 5, 4, 5, 15, 52, 15, 10, 10, 15, 52, 203, 52, 30, 25, 30, 52, 203, 877, 203, 104, 75, 75, 104, 203, 877, 4140, 877, 406, 260, 225, 260, 406, 877, 4140, 21147, 4140, 1754, 1015, 780, 780, 1015, 1754, 4140, 21147 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS Row sums = A014322: (1, 2, 5, 14, 44, 154,...) the Bell numbers convolved with themselves. LINKS FORMULA Triangle read by rows, T(n,k) = A000110(n-k)*A000110(k) EXAMPLE First few rows of the triangle = 1; 1, 1; 2, 1, 2; 5, 2, 2, 5; 15, 5, 4, 5, 15; 52, 15, 10, 10, 15, 52; 203, 52, 30, 25, 30, 52, 203; ... Row 3 = (5, 2, 2, 5) = termwise products of (1, 1, 2, 5) and (5, 2, 1, 1) = (5*1, 1*2, 2*1, 5*1). CROSSREFS A000110, Cf. A014322 Sequence in context: A147292 A078391 A153206 * A109631 A337222 A095149 Adjacent sequences:  A144152 A144153 A144154 * A144156 A144157 A144158 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Sep 12 2008 EXTENSIONS More terms from Philippe Deléham, Jan 29 2012 STATUS approved

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Last modified April 15 02:27 EDT 2021. Contains 342974 sequences. (Running on oeis4.)