51331

Appears in sequences

• Numerator of Sum_{k=1..n} 1/(2k-1)^4.at n=2A120269
• Number of -n..n arrays of 4 elements with first and second differences also in -n..n.at n=9A201089
• a(n) = ((2n-1)!!)^4 * Sum_{i=1..n} 1/(2*i-1)^4.at n=3A291586
• Square array T(n,k), n>=0, k>=0, read by antidiagonals: T(n,k) = ((2n-1)!!)^k * Sum_{i=1..n} 1/(2*i-1)^k.at n=31A291656
• Sum of the 4th powers of the divisor complements of the odd proper divisors of n.at n=14A352050