OFFSET
1,2
LINKS
C. Benedetti, R. S. González D'León, C. Hanusa, P. E. Harris, A. Khare, A. H. Morales, M. Yip, A combinatorial model for computing volumes of flow polytopes, arXiv:1801.07684 [math.CO], 2018-2019.
C. Benedetti, R. S. González D'León, C. Hanusa, P. E. Harris, A. Khare, A. H. Morales, M. Yip, A combinatorial model for computing volumes of flow polytopes, Trans. Amer. Math. Soc., 372 (2019), 3369-3404.
J. Jang and J. S. Kim, Volumes of flow polytopes related to caracol graphs, arXiv:1911.10703 [math.CO], 2019
M. Yip, A Fuss-Catalan variation of the caracol flow polytope, arXiv:1910.10060 [math.CO], 2019.
FORMULA
EXAMPLE
For n=3, a(3) = 32 = 2*(3+1)^2.
MAPLE
a:=proc(n)
return (1/n)*binomial(2*n-2, n-1)*(n+1)^(n-1);
end proc:
MATHEMATICA
Array[(1/#) Binomial[2 # - 2, # - 1] (# + 1)^(# - 1) &, 17] (* Michael De Vlieger, Jan 28 2020 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alejandro H. Morales, Jan 26 2020
STATUS
approved