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 A054688 Number of nonnegative integer n X n matrices with sum of elements equal to n; polynomial symmetric functions of matrix of order n. 7
 1, 1, 10, 165, 3876, 118755, 4496388, 202927725, 10639125640, 635627275767, 42634215112710, 3172596834321200, 259398433286078100, 23116565732981832150, 2230164446387219893320, 231574204669402103059965, 25751746463640423324267024, 3053419608195531383028424575 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 REFERENCES E. R. Cavalcanti and M. A. Spohn, On the applicability of mobility metrics for user movement pattern recognition in MANETs, in Proceeding MobiWac '13 Proceedings of the 11th ACM international symposium on Mobility management and wireless access, Pages 123-130, ACM New York, NY, USA 2013, ISBN: 978-1-4503-2355-0 doi:10.1145/2508222.2508228 LINKS FORMULA a(n) = C(n^2+n-1, n). a(n) = [x^n] 1/(1 - x)^(n^2). - Ilya Gutkovskiy, Oct 03 2017 MATHEMATICA Table[Binomial[n^2 + n - 1, n], {n, 0, 17}] (* Michael De Vlieger, Oct 05 2017 *) PROG (PARI) a(n) = binomial(n^2+n-1, n); \\ Altug Alkan, Oct 03 2017 CROSSREFS Cf. A001700, A007716. Sequence in context: A278096 A272499 A305604 * A229228 A112650 A006295 Adjacent sequences:  A054685 A054686 A054687 * A054689 A054690 A054691 KEYWORD easy,nonn AUTHOR Vladeta Jovovic, Apr 19 2000 EXTENSIONS a(15) corrected by Ilya Gutkovskiy, Oct 03 2017 STATUS approved

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Last modified May 26 17:17 EDT 2019. Contains 323597 sequences. (Running on oeis4.)