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 A127773 Triangle read by rows: row n consists of n-1 zeros followed by n(n+1)/2. 11
 1, 0, 3, 0, 0, 6, 0, 0, 0, 10, 0, 0, 0, 0, 15, 0, 0, 0, 0, 0, 21, 0, 0, 0, 0, 0, 0, 28, 0, 0, 0, 0, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0, 0, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS EXAMPLE First few rows of the triangle are: 1; 0, 3; 0, 0, 6; 0, 0, 0, 10; 0, 0, 0, 0, 15; ... MATHEMATICA Flatten[Table[{(n(n+1))/2, Table[0, {n}]}, {n, 10}]]  (* Harvey P. Dale, Apr 03 2011 *) CROSSREFS Cf. A127648, A000217, A127774. Sequence in context: A051174 A273089 A330735 * A194498 A193986 A062688 Adjacent sequences:  A127770 A127771 A127772 * A127774 A127775 A127776 KEYWORD nonn,easy,tabl AUTHOR Gary W. Adamson, Jan 28 2007 STATUS approved

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Last modified May 18 05:47 EDT 2021. Contains 343994 sequences. (Running on oeis4.)