55260

Appears in sequences

• a(n) is the constant term in the expansion of Product_{k=1..n} (x^k + 1/x^k)^4.at n=5A124996
• Number of 6 X n 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.at n=7A208641
• Numbers k such that all primes dividing the k-th composite number divide k as well.at n=44A368309