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 A172078 a(n) = n*(16*n^2 + 3*n - 13)/6. 7
 0, 1, 19, 70, 170, 335, 581, 924, 1380, 1965, 2695, 3586, 4654, 5915, 7385, 9080, 11016, 13209, 15675, 18430, 21490, 24871, 28589, 32660, 37100, 41925, 47151, 52794, 58870, 65395, 72385, 79856, 87824, 96305, 105315, 114870, 124986, 135679 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Generated by the formula n*(n+1)*(2*d*n-(2*d-3))/6 for d=8. In fact, the sequence is related to A001107 by a(n) = n*A001107(n) - Sum_{k=0..n-1} A001107(k), and this is the case d=8 in the identity n*(n*(d*n-d+2)/2) - Sum_{k=0..n-1} k*(d*k-d+2)/2 = n*(n+1)*(2*d*n-2*d+3)/6. - Bruno Berselli, Dec 14 2010 Inverse binomial transform of this sequence: 0, 1, 17, 16, 0, 0 (0 continued). - Bruno Berselli, Dec 14 2010 Principal diagonal of the convolution array A213835. - Clark Kimberling, Jul 04 2012 REFERENCES E. Deza and M. M. Deza, Figurate numbers, World Scientific Publishing (2012), page 93. - Bruno Berselli, Feb 13 2014 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..1000 B. Berselli, A description of the recursive method in Comments lines: website Matem@ticamente (in Italian), 2008. Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1). FORMULA a(n) = n*(n+1)*(16*n-13)/6. G.f.: x*(1+15*x)/(1-x)^4. - Bruno Berselli, Dec 14 2010 a(n) = Sum_{i=0..n-1} (n-i)*(16*i+1), with a(0)=0. - Bruno Berselli, Feb 10 2014 E.g.f.: x*(6 +51*x +16*x^2)*exp(x)/6. - G. C. Greubel, Aug 30 2019 MAPLE A172078:=n->(16*n^3+3*n^2-13*n)/6: seq(A172078(n), n=0..50); # Wesley Ivan Hurt, Jan 21 2017 MATHEMATICA LinearRecurrence[{4, -6, 4, -1}, {0, 1, 19, 70}, 50] (* Vincenzo Librandi, Mar 01 2012 *) PROG (PARI) a(n)=n*(16*n^2+3*n-13)/6 \\ Charles R Greathouse IV, Oct 07 2015 (MAGMA) [n*(n+1)*(16*n-13)/6: n in [0..40]]; // G. C. Greubel, Aug 30 2019 (Sage) [n*(n+1)*(16*n-13)/6 for n in (0..40)] # G. C. Greubel, Aug 30 2019 (GAP) List([0..40], n-> n*(n+1)*(16*n-13)/6); # G. C. Greubel, Aug 30 2019 CROSSREFS Cf. A001107. Cf. similar sequences listed in A237616. Sequence in context: A007547 A217081 A010007 * A196136 A198002 A093350 Adjacent sequences:  A172075 A172076 A172077 * A172079 A172080 A172081 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Jan 25 2010 STATUS approved

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Last modified May 9 19:47 EDT 2021. Contains 343746 sequences. (Running on oeis4.)