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 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

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Last modified June 23 09:00 EDT 2021. Contains 345395 sequences. (Running on oeis4.)