The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A136521 Triangle read by rows: (1, 2, 2, 2, ...) on the main diagonal and the rest zeros. 3
 1, 0, 2, 0, 0, 2, 0, 0, 0, 2, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS G. C. Greubel, Rows n = 0..25 of the triangle, flattened FORMULA By columns, (1, 0, 0, 0, ...) in leftmost column; all others are (2, 0, 0, 0, ...). By rows, row 1 = 1, others = (n-1) zeros followed by "2". A007318(n,k) * T(n,k) = A124927(n,k). T(n,k) * A007318(n,k) = A134058(n,k). A001263(n,k) * T(n,k) = A136522(n,k). From G. C. Greubel, May 03 2021: (Start) T(n, k) = 2*[k=n] - [n=0]. Sum_{k=0..n} T(n, k) = A040000(n). (End) EXAMPLE First few rows of the triangle are: 1; 0, 2; 0, 0, 2; 0, 0, 0, 2; 0, 0, 0, 0, 2; ... MATHEMATICA Table[2*Boole[k==n] -Boole[n==0], {n, 0, 12}, {k, 0, n}]//Flatten (* G. C. Greubel, May 03 2021 *) PROG (Sage) flatten([[2*bool(k==n) -bool(n==0) for k in (0..n)] for n in (0..12)]) # G. C. Greubel, May 03 2021 CROSSREFS Cf. A001263, A007318, A040000, A124927, A134058, A136522. Sequence in context: A340988 A134013 A112301 * A066448 A108497 A108498 Adjacent sequences: A136518 A136519 A136520 * A136522 A136523 A136524 KEYWORD nonn,tabl,less,easy AUTHOR Gary W. Adamson, Jan 02 2008 EXTENSIONS More terms added by G. C. Greubel, May 03 2021 STATUS approved

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

Last modified May 29 04:03 EDT 2023. Contains 363029 sequences. (Running on oeis4.)