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

1, 2, 13, 146, 2343, 48984

Offset

0,2

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.

Links

Table of n, a(n) for n=0..5.

Crossrefs

Cf. A079330.

Sequence in context: A178248 A107699 A079330 * A309799 A324464 A364339

Adjacent sequences: A059364 A059365 A059366 * A059368 A059369 A059370

Keyword

nonn

Author

N. J. A. Sloane, Jan 28 2001

Status

approved