A059367 From solution to x = tan x (next term is not an integer).

1, 2, 13, 146, 2343, 48984

Offset: 0

Author

N. J. A. Sloane, Jan 28 2001

Keywords

• nonn

Comments

Suppose 1/y = 1/x + arctan(x). Then arctan(x) = Sum_{n>=0} a(n) * y^(2n+1)/(2n+1)!!. Note that a(6) = 6316012/5. a(7) = 38759594. - Michael Somos, Jan 01 2021

References

• L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 171, #33.

Crossrefs

Cf. A079330.