721887

Appears in sequences

• Expansion of 1/(x + sqrt(1-4x)).at n=12A081696
• Antidiagonal sums of the slanted Catalan convolution table A100247.at n=18A100249
• Number of lattice paths from (0,0) to (i,n-2*i) that do not go above the diagonal x=y using steps in {(1,0), (0,1)}.at n=36A357654