9454725

Appears in sequences

• Group odd numbers into (1), (3,5), (7,9,11), (13,15,17,19), ...; a(n) = product of n-th group.at n=4A062032
• E.g.f. A(x) satisfies A(x) = exp( arcsinh(x * A(x)^4) ).at n=6A385442