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 A216209 Triangle read by rows: T(n,k) = n+k with 0 <= k <= 2*n. 0
 0, 1, 2, 3, 2, 3, 4, 5, 6, 3, 4, 5, 6, 7, 8, 9, 4, 5, 6, 7, 8, 9, 10, 11, 12, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Triangle begins:                      0                   1  2  3                2  3  4  5  6             3  4  5  6  7  8  9          4  5  6  7  8  9 10 11 12       5  6  7  8  9 10 11 12 13 14 15    6  7  8  9 10 11 12 13 14 15 16 17 18 7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 The left half together with the central column is the A051162 triangle. Row sums of the reciprocals of the terms in the above triangle converge to log(3). See link to Eric Naslund's answer. [Mats Granvik, Apr 07 2013] LINKS CROSSREFS Cf. A051162, A094727. Sequence in context: A256992 A261323 A134986 * A289172 A215653 A286717 Adjacent sequences:  A216206 A216207 A216208 * A216210 A216211 A216212 KEYWORD nonn,tabf,easy AUTHOR Alex Ratushnyak, Mar 12 2013 STATUS approved

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Last modified October 17 14:22 EDT 2018. Contains 316281 sequences. (Running on oeis4.)