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 A138057 Triangle read by rows: row n consists of 0 followed by n (n+1)'s with alternating signs. 1
 0, 0, -2, 0, -3, 3, 0, -4, 4, -4, 0, -5, 5, -5, 5, 0, -6, 6, -6, 6, -6, 0, -7, 7, -7, 7, -7, 7, 0, -8, 8, -8, 8, -8, 8, -8, 0, -9, 9, -9, 9, -9, 9, -9, 9, 0, -10, 10, -10, 10, -10, 10, -10, 10, -10 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA Cf. A131738. CROSSREFS Sequence in context: A099838 A127449 A328911 * A053727 A265208 A265020 Adjacent sequences:  A138054 A138055 A138056 * A138058 A138059 A138060 KEYWORD tabl,sign AUTHOR Paul Curtz, May 02 2008 STATUS approved

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Last modified December 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)