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 A260775 Certain directed lattice paths. 1
 1, 4, 28, 264, 2860, 33592, 416024, 5348880, 70715340, 955277400, 13128240840, 182965127280, 2579808294648, 36734706144304, 527495903500720, 7629973004184608, 111068129754096396, 1625888084299461528, 23919596771720906984, 353467725574013402800 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS See Dziemianczuk (2014) for precise definition. LINKS Lars Blomberg, Table of n, a(n) for n = 0..100 M. Dziemianczuk, On Directed Lattice Paths With Additional Vertical Steps, arXiv preprint arXiv:1410.5747 [math.CO], 2014. Maciej Dziemiańczuk, On directed lattice paths with vertical steps, Discrete Math., 339 (2016), 1116-1139. Alex Hall, OEIS explorer FORMULA See Dziemianczuk (2014) Equation (36b) with N=2. a(n) = 2 * A000108(2*n) for n > 0. [Agrees with the reference, found using OEIS explorer.] - Andrey Zabolotskiy, May 08 2021 CROSSREFS Cf. A000108, A260769, A260770, A260771, A260772, A260773, A260774, A260776. Sequence in context: A177403 A360775 A196523 * A292810 A368892 A360727 Adjacent sequences: A260772 A260773 A260774 * A260776 A260777 A260778 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Jul 30 2015 EXTENSIONS More terms from Lars Blomberg, Aug 01 2015 STATUS approved

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Last modified September 12 03:03 EDT 2024. Contains 375842 sequences. (Running on oeis4.)