867395

Appears in sequences

• a(n) = Sum_{i=1..n} binomial(i+1,2)^5.at n=4A085440
• a(n) = Sum_{k = 0..n} (k*(k+1)/2)^n.at n=5A249564
• Array read by antidiagonals: T(n,k) = Sum_{i=1..n} binomial(1+i,2)^k.at n=60A334781