A266911 GCD of A002443(n) and A002444(n), numerator and denominator in Feinler's formula for the Bernoulli number B_{2n}.

1, 1, 2, 3, 2, 2, 60, 3, 10, 42, 60, 30, 252, 4, 8, 231, 210, 2, 5460, 42, 660, 1260, 840, 210, 7956, 396, 440, 228, 120, 24, 720720, 2145, 510, 14490, 180, 330, 17117100, 36036, 360, 378, 26180, 3740, 3483480, 5460, 83720, 5442360, 1755600, 2310, 2187900, 2652, 17160, 13860, 3960, 440

Offset: 0

Author

M. F. Hasler, Jan 05 2016

Keywords

• nonn

Comments

Note that A002443/A002444 = |B_{2n}| = |A000367/A002445|.

Crossrefs

Cf. A002443, A002444, A000367, A002445.

Formula

a(n) = gcd(A002443(n),A002444(n)).

Extensions

More terms from N. J. A. Sloane, Jan 08 2016