This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A135839 Triangle read by rows: starting with A138174, replace left border with (1, 1, 1, ...). 3
 1, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row sums = (1, 2, 2, 3, 3, 4, 4, 5, 5, ...). LINKS G. C. Greubel, Table of n, a(n) for the first 50 rows FORMULA Given A128174, replace left border with (1, 1, 1, ...). Triangle read by rows, odd rows = n terms of (1, 0, 1, ...); even rows = n terms of (1, 1, 0, 1, 0, 1, ...). By columns, leftmost column = (1, 1, 1, ...); all others = (1, 0, 1, 0, 1, ...). T(n,1) = T(n,n) = 1, T(n,k) = (1 - (-1)^(n-k-1))/2. - G. C. Greubel,Dec 05 2016 EXAMPLE First few rows of the triangle are: 1; 1, 1; 1, 0, 1; 1, 1, 0, 1; 1, 0, 1, 0, 1; 1, 1, 0, 1, 0, 1; 1, 0, 1, 0, 1, 0, 1; ... MATHEMATICA T[1, 1] := 1; T[n_, 1] := 1; T[n_, n_] := 1; T[n_, k_] := (1 - (-1)^(n - k + 1))/2; Table[T[n, k], {n, 1, 10}, {k, 1, n}]//Flatten (* G. C. Greubel, Dec 05 2016 *) CROSSREFS Sequence in context: A103994 A051731 A304569 * A071022 A155076 A257196 Adjacent sequences:  A135836 A135837 A135838 * A135840 A135841 A135842 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Dec 01 2007 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 19 08:34 EDT 2019. Contains 322241 sequences. (Running on oeis4.)