1864921

Properties

Appears in sequences

• Expansion of e.g.f. Sum_{k>=1} (sec(x^k) - 1) (even powers only).at n=4A330528
• E.g.f.: Sum_{k>=1} (1 - sech(x^k)) (even powers only).at n=4A331338
• Number of compositions of n where there are (2*k)!/2 sorts of part k.at n=5A370379
• Prime numbersat n=139593