The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A133820 Triangle whose rows are sequences of increasing cubes: 1; 1,8; 1,8,27; ... . 3
 1, 1, 8, 1, 8, 27, 1, 8, 27, 64, 1, 8, 27, 64, 125, 1, 8, 27, 64, 125, 216, 1, 8, 27, 64, 125, 216, 343, 1, 8, 27, 64, 125, 216, 343, 512, 1, 8, 27, 64, 125, 216, 343, 512, 729, 1, 8, 27, 64, 125, 216, 343, 512, 729, 1000 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Reading the triangle by rows produces the sequence 1,1,8,1,8,27,1,8,27,64,..., analogous to A002260. LINKS Reinhard Zumkeller, Rows n = 1..120 of triangle, flattened FORMULA O.g.f.: (1+4qx+q^2x^2)/((1-x)(1-qx)^4) = 1 + x(1 + 8q) + x^2(1 + 8q + 27q^2) + ... . EXAMPLE Triangle starts 1; 1, 8; 1, 8, 27; 1, 8, 27, 64; 1, 8, 27, 64, 125; MATHEMATICA Module[{nn=10, c}, c=Range[nn]^3; Flatten[Table[Take[c, n], {n, 10}]]] (* Harvey P. Dale, Mar 05 2014 *) PROG (Haskell) a133820 n k = a133820_tabl !! (n-1) !! (k-1) a133820_row n = a133820_tabl !! (n-1) a133820_tabl = map (`take` (tail a000578_list)) [1..] -- Reinhard Zumkeller, Nov 11 2012 CROSSREFS Cf. A000537 (row sums), A002260, A019522, A133819, A133821, A133823. Sequence in context: A198988 A098367 A141228 * A258718 A019864 A230151 Adjacent sequences:  A133817 A133818 A133819 * A133821 A133822 A133823 KEYWORD easy,nonn,tabl AUTHOR Peter Bala, Sep 25 2007 EXTENSIONS Offset changed by Reinhard Zumkeller, Nov 11 2012 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 December 1 10:36 EST 2021. Contains 349427 sequences. (Running on oeis4.)