50212

Appears in sequences

• Number of Sidon subsets of {1,...,n} of size 5.at n=29A241689
• Number of length 2+3 0..n arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=26A248539
• Main diagonal of square arrays A114881 and A249741.at n=34A249743
• a(n) = 4*5^n - 3*4^n.at n=6A257285
• Square array T(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where T(n,k) = [x^n] 1/(1 - x*(1+x)^n)^k.at n=52A362079
• a(n) = Sum_{k=0..n} (-1)^k * binomial(-2,k) * binomial(n*k,n-k).at n=7A362084