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 A127701 Infinite lower triangular matrix with (1, 2, 3,...) in the main diagonal, (1, 1, 1,...) in the subdiagonal and the rest zeros. 17
 1, 1, 2, 0, 1, 3, 0, 0, 1, 4, 0, 0, 0, 1, 5, 0, 0, 0, 0, 1, 6, 0, 0, 0, 0, 0, 1, 7, 0, 0, 0, 0, 0, 0, 1, 8, 0, 0, 0, 0, 0, 0, 0, 1, 9, 0, 0, 0, 0, 0, 0, 0, 0, 1, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 12, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 13, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Eigensequence of the triangle = A001040 starting (1, 3, 10, 43, 225,...). [From Gary W. Adamson, Dec 29 2008] LINKS EXAMPLE First few rows of the triangle are: 1; 1, 2; 0, 1, 3; 0, 0, 1, 4; 0, 0, 0, 1, 5; 0, 0, 0, 0, 1, 6; 0, 0, 0, 0, 0, 1, 7; ... MATHEMATICA Join[{1}, Flatten[Table[Join[{PadRight[{}, n-2, 0], 1, n}], {n, 2, 15}]]] (* Harvey P. Dale, Jan 06 2014 *) CROSSREFS A001040 [From Gary W. Adamson, Dec 29 2008] Sequence in context: A309576 A128132 A158821 * A004199 A062283 A136493 Adjacent sequences:  A127698 A127699 A127700 * A127702 A127703 A127704 KEYWORD nonn,easy,tabl AUTHOR Gary W. Adamson, Jan 23 2007 EXTENSIONS More terms from Jon E. Schoenfield, May 26 2007 STATUS approved

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Last modified September 26 22:53 EDT 2020. Contains 337377 sequences. (Running on oeis4.)