3407040

Appears in sequences

• Column 5 of triangle A055898.at n=13A055901
• Triangle T(n,k) of number of minimal 5-covers of a labeled n-set that cover k points of that set uniquely (k=5,..,n).at n=12A057966
• Triangle read by rows: T(n,k) = n!*Pell(n-k+1)/k!, where Pell(n)=A000129(n).at n=38A110327
• Integer areas of the tangential triangles corresponding to the integer-sided triangles with integer areas.at n=27A230361