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 A137853 Triangle read by rows: row sums give natural numbers A000027. 1
 1, 0, 2, 1, 2, 0, 1, 0, 3, 0, 0, 2, 3, 0, 0, 1, 2, 3, 0, 0, 0, 1, 2, 0, 4, 0, 0, 0, 1, 0, 3, 4, 0, 0, 0, 0, 0, 2, 3, 4, 0, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 0, 0, 0, 1, 2, 3, 0, 5, 0, 0, 0, 0, 0, 0, 1, 2, 0, 4, 5, 0, 0, 0, 0, 0, 0, 0, 1, 0, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 3, 4, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Each row contains a series of consecutive numbers. There is a diagonal pattern of zeros in the left part of the table. LINKS Table of n, a(n) for n=1..105. EXAMPLE 1 = 1 0+2 = 2 1+2+0 = 3 1+0+3+0 = 4 0+2+3+0+0 = 5 1+2+3+0+0+0 = 6 1+2+0+4+0+0+0 = 7 1+0+3+4+0+0+0+0 = 8 0+2+3+4+0+0+0+0+0 = 9 CROSSREFS Cf. A000027. Sequence in context: A287418 A125925 A340795 * A213890 A226460 A358360 Adjacent sequences: A137850 A137851 A137852 * A137854 A137855 A137856 KEYWORD nonn,tabl AUTHOR Mats Granvik, Feb 14 2008 STATUS approved

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Last modified May 19 00:35 EDT 2024. Contains 372666 sequences. (Running on oeis4.)