OFFSET
0,3
LINKS
Juan B. Gil, Peter R. W. McNamara, Jordan O. Tirrell, Michael D. Weiner, From Dyck paths to standard Young tableaux, arXiv:1708.00513 [math.CO], 2017.
FORMULA
a(n) = Sum_{j=0..n+1} 180*(2n)!*(2j+2)!*(2n-3j+2)/(j!*(j+1)!*(j+2)!*(j+4)!*(n-j+1)!*(n-j+3)!) (conjectured). - Michael D. Weiner, May 11 2016
36*(n-1)*(2*n-1)*(2*n-3)*a(n-2)-4*(2*n-1)*(5*n^2+22*n+15)*a(n-1)+(n+3)*(n+5)*(n+6)*a(n) = 0 (conjectured). - Michael D. Weiner, May 14 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 25 2008
STATUS
approved