26600

Appears in sequences

• a(n) = n^2*(n^2 - 1)/6.at n=20A008911
• Stirling2 triangle with scaled diagonals (powers of 10).at n=33A075505
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=2, r=3, I={-1,0,1}.at n=45A080002
• Triangle read by rows: T(n,k) is the number of ordered trees having n edges and k branches of length 2.at n=41A101307
• Number of ordered trees with n edges and having no branches of length 2.at n=12A101308
• Coefficients of the A-Dyson Mod 27 identity.at n=39A104501
• Coefficients of the v=1 member of a family of certain orthogonal polynomials.at n=42A129065
• Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to n-3.at n=16A180293
• Integers i such that the equation A088387(i) = p has N > 1 solutions in the interval prevprime(i)..nextprime(i).at n=20A308617
• Lesser of amicable pair m < n defined by t(n) = m and t(m) = n where t(n) = psi(n) - n and psi(n) = A001615(n) is the Dedekind psi function.at n=15A323329
• a(n) is the number of subsets of {1..n} that contain exactly 3 odd and 1 even numbers.at n=41A333319