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 A176919 Triangle by columns: (1, 2, 3,...) in each column interleaved with (0, 1, 2,...)zeros. Columns >1 shifted down twice. 1
 1, 2, 0, 3, 1, 0, 4, 0, 0, 0, 5, 2, 1, 0, 0, 6, 0, 0, 0, 0, 0, 7, 3, 0, 1, 0, 0, 0, 8, 0, 2, 0, 0, 0, 0, 0, 9, 4, 0, 0, 1, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 5, 3, 2, 0, 1, 0, 0, 0, 0, 0, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums of n-th row = A065608(n+1). LINKS FORMULA Triangle, left border = (1, 2, 3,...). Each successive column is shifted down twice from previous column and interleaved with k zeros. EXAMPLE First few rows of the triangle = 1; 2, 0; 3, 1, 0; 4, 0, 0, 0; 5, 2, 1, 0, 0; 6, 0, 0, 0, 0, 0; 7, 3, 0, 1, 0, 0, 0; 8, 0, 2, 0, 0, 0, 0, 0; 9, 4, 0, 0, 1, 0, 0, 0, 0; 10, 0, 0, 0, 0, 0, 0, 0, 0, 0; 11, 5, 3, 2, 0, 1, 0, 0, 0, 0, 0; 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 13, 6, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0; 14, 0, 4, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0; 15, 7, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0; 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 17, 8, 5, 0, 0, 2, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0; 18, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 19, 9, 0, 4, 3, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0; ... CROSSREFS Cf. A065608 Sequence in context: A054372 A070679 A177443 * A220645 A127374 A098862 Adjacent sequences:  A176916 A176917 A176918 * A176920 A176921 A176922 KEYWORD nonn,tabl AUTHOR Gary W. Adamson & Mats Granvik, Apr 29 2010 STATUS approved

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Last modified August 19 18:33 EDT 2019. Contains 326133 sequences. (Running on oeis4.)