4572288000domain: NAppears in sequencesDeterminant of n X n matrix M_(i,j) = binomial(i^2, j).at n=5A086205a(n) is the denominator of Sum_{k=1..n} 1 / (k*k!).at n=9A354401a(n) is the denominator of Sum_{k=1..n} (-1)^(k+1) / (k*k!).at n=9A354404