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 A131430 Row sums of triangle A131429. 2
 1, 2, 7, 25, 88, 311, 1114, 4050, 14917, 55528, 208459, 787920, 2994655, 11433998, 43824437, 168520201, 649840740, 2512011359, 9731179138, 37768570827, 146833956266, 571711568905, 2229035221824, 8701426599353, 34005503702176, 133030452858279, 520905732440782 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 0..200 FORMULA a(n) = binomial(2*n, n) - (n+1) + Sum_{k=0..n} binomial(2*k, k)/(k+1). - Andrew Howroyd, Aug 28 2018 EXAMPLE a(3) = 25 = sum of row 3 terms of triangle A131429: (5 + 5 + 6 + 9). PROG (PARI) a(n)={binomial(2*n, n) - n - 1 + sum(k=0, n, binomial(2*k, k)/(k+1))} \\ Andrew Howroyd, Aug 28 2018 CROSSREFS Cf. A000108, A131427, A131428, A131429. Sequence in context: A289446 A289598 A030017 * A007484 A070859 A048576 Adjacent sequences:  A131427 A131428 A131429 * A131431 A131432 A131433 KEYWORD nonn AUTHOR Gary W. Adamson, Jul 10 2007 EXTENSIONS Terms a(10) and beyond from Andrew Howroyd, Aug 28 2018 STATUS approved

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Last modified January 21 03:58 EST 2022. Contains 350473 sequences. (Running on oeis4.)