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| Try putting the entire problem in Mathematica notation: > Sum[(CatalanNumber[k]/2^(2 k + 1))^2 (13 k + 17), {k, 0, Infinity}] |
| I'm a bit confused by Wolfram Alpha's handling of subscripts. Using the Mathematica convention (Subscript[x, n]) doesn't work, and the plain text alternative (x_n) provides inconsistent results (interpreted differently by Wolfram Alpha depending on... |