86830

Appears in sequences

• a(n) = n*(1 + n)*(3 - 4*n + 4*n^2)/6.at n=18A213840
• a(n) = Sum_{k=0..n} binomial(n,2k)^2*binomial(n-k,k).at n=8A278405
• Number of integer compositions of n whose leaders of strictly decreasing runs are strictly increasing.at n=29A374762