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 A131818 A130296 + A002260 - A000012. Triangle read by rows: row n consists of n, 2, 3, 4, ..., n. 3
 1, 2, 2, 3, 2, 3, 4, 2, 3, 4, 5, 2, 3, 4, 5, 6, 2, 3, 4, 5, 6, 7, 2, 3, 4, 5, 6, 7, 8, 2, 3, 4, 5, 6, 7, 8, 9, 2, 3, 4, 5, 6, 7, 8, 9, 10, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums = A034856; (1, 4, 8, 13, 19, 26, 34, ...). LINKS FORMULA A130296 + A002260 - A000012 as infinite lower triangular matrices. T(n, 1) = n, T(n, k) = k for k > 1. - Michel Marcus, Feb 12 2014 EXAMPLE First few rows of the triangle:   1;   2, 2;   3, 2, 3;   4, 2, 3, 4;   5, 2, 3, 4, 5;   6, 2, 3, 4, 5, 6;   7, 2, 3, 4, 5, 6, 7;   ... MATHEMATICA Table[Join[{n}, Range[2, n]], {n, 15}]//Flatten (* Harvey P. Dale, Feb 24 2021 *) PROG (PARI) t(n, k) = if (k==1, n, k); \\ Michel Marcus, Feb 12 2014 CROSSREFS Cf. A130296, A002260, A034856. Sequence in context: A338283 A104324 A193212 * A222111 A222438 A222027 Adjacent sequences:  A131815 A131816 A131817 * A131819 A131820 A131821 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Jul 18 2007 EXTENSIONS More terms from Michel Marcus, Feb 12 2014 STATUS approved

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Last modified May 18 01:52 EDT 2022. Contains 353779 sequences. (Running on oeis4.)