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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A130461 Triangle, antidiagonals of an array generated from A130460. 3
 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 3, 1, 1, 1, 2, 6, 4, 1, 1, 1, 2, 6, 12, 5, 1, 1, 1, 2, 6, 24, 20, 6, 1, 1, 1, 2, 6, 24, 60, 30, 7, 1, 1, 1, 2, 6, 24, 120, 120, 42, 8, 1, 1, 1, 2, 6, 24, 120, 360, 210, 56, 9, 1, 1, 1, 2, 6, 24, 120, 720, 840, 336, 72, 10, 1, 1, 1, 2, 6, 24, 120, 720, 2520 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,9 COMMENTS Rows tend to the factorials: (1, 1, 2, 6, 24,...). Row sums = A130476: (1, 2, 3, 5, 8, 15, 28, 61, 132,...). LINKS FORMULA Let A130460 = M, an infinite lower triangular matrix and V = [1, 1, 1,...], the first row of an array. Perform M * V = second row,...; (n+1)-th row = M * n-th row. The triangle = antidiagonals of the array. EXAMPLE The array = 1,...1,...1,...1,....1,....1,... 1,...1,...2,...3,....4,....5,... 1,...1,...2,...6,...12,...20,... 1,...1,...2,...6,...24,...60,... 1,...1,...2,...6,...24,..120,... 1,...1,...2,...6,...24,..120,... ... First few rows of the triangle are: 1; 1, 1; 1, 1, 1; 1, 1, 2, 1; 1, 1, 2, 3, 1; 1, 1, 2, 6, 4, 1; 1, 1, 2, 6, 12, 5, 1; 1, 1, 2, 6, 24, 20, 6, 1; 1, 1, 2, 6, 24, 60, 30, 7, 1; ... CROSSREFS Cf. A130460, A130476, A130477, A130478. Sequence in context: A238888 A179748 A096670 * A225631 A306209 A267482 Adjacent sequences:  A130458 A130459 A130460 * A130462 A130463 A130464 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, May 28 2007 EXTENSIONS a(23) and a(38) corrected by Gionata Neri, Jun 22 2016 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 January 22 10:13 EST 2022. Contains 350481 sequences. (Running on oeis4.)