42260

Appears in sequences

• Number of length 1+3 0..n arrays with some pair in every consecutive four terms totalling exactly n.at n=18A245951
• Numbers whose squares remain squares when prepended with 2 and appended with 25 in base 10.at n=2A249968
• a(n) = Sum_{k=0..n} binomial(n,k) * binomial(4*k,n-k).at n=7A389225