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 A177991 Triangle read by rows, A070909 * A177990 3
 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 2, 1, 1, 1, 3, 1, 2, 1, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 4, 1, 3, 1, 2, 1, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 COMMENTS Row sums = A117142: (1, 2, 3, 5, 6, 9,...) LINKS Table of n, a(n) for n=0..65. Peter Bala, Matrices with repeated columns - the generalised Appell groups FORMULA As infinite lower triangular matrices, A070909 * A177990 EXAMPLE First few rows of the triangle = 1; 1, 1; 1, 1, 1; 1, 2, 1, 1; 1, 2, 1, 1, 1; 1, 3, 1, 2, 1, 1; 1, 3, 1, 2, 1, 1, 1; 1, 4, 1, 3, 1, 2, 1, 1; 1, 4, 1, 3, 1, 2, 1, 1, 1; 1, 5, 1, 4, 1, 3, 1, 2, 1, 1; 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1; 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1; 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1; 1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1; 1, 7, 1, 6, 1, 5, 1, 4, 1, 3, 1, 2, 1, 1, 1; ... CROSSREFS A177994 = A177990 * A070909. Cf. A117142. Sequence in context: A238747 A101873 A336691 * A146289 A214575 A081418 Adjacent sequences: A177988 A177989 A177990 * A177992 A177993 A177994 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, May 16 2010 EXTENSIONS a(28)=1 inserted before the first "4" by Georg Fischer, Dec 28 2021 STATUS approved

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Last modified March 2 07:45 EST 2024. Contains 370460 sequences. (Running on oeis4.)