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 A173108 Triangle, A000110 in every column >0, shifted down twice. 3
 1, 1, 2, 1, 5, 1, 15, 2, 1, 52, 5, 1, 203, 15, 2, 1, 877, 52, 5, 1, 4140, 203, 15, 2, 1, 21147, 877, 52, 5, 1, 115975, 4140, 203, 15, 2, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Row sums = A173109: (1, 1, 3, 6, 18, 58, 221, 935,...) Let the triangle = M. Then Lim_{n->inf.} M^n = A173110: (1, 1, 3, 6, 20, 60,...). LINKS FORMULA Bell sequence in every column, for columns >0, shifted down twice. EXAMPLE First few rows of the triangle = 1; 1; 2, 1; 5, 1; 15, 2, 1; 52, 5, 1; 203, 15, 2, 1; 877, 52, 5, 1; 4140, 203, 15, 2, 1; 21147, 877, 52, 5, 1; 115975, 4140, 203, 15, 2, 1; ... CROSSREFS Cf. A000110, A173109, A173110, A173111 Sequence in context: A163963 A119763 A092142 * A173111 A140879 A006556 Adjacent sequences:  A173105 A173106 A173107 * A173109 A173110 A173111 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Feb 09 2010 STATUS approved

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Last modified May 23 00:23 EDT 2013. Contains 225585 sequences.