A260775 Certain directed lattice paths.
1, 4, 28, 264, 2860, 33592, 416024, 5348880, 70715340, 955277400, 13128240840, 182965127280, 2579808294648, 36734706144304, 527495903500720, 7629973004184608, 111068129754096396, 1625888084299461528, 23919596771720906984, 353467725574013402800
Offset: 0
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
Extensions
More terms from Lars Blomberg, Aug 01 2015
Comments