A158599 Numerators of x^(2n-1) in the series expansion of Steinhaus's approximate angle trisection.

1, 1, 1, 7, 443, 1291, 547, -14525053, -2152141, -1619851403, -1536016974551, -477931750239611, -3034967131152703, -422006960276038428191, 2494365752617228421, 1154806795095971456827, 49828124197505806707965147

Offset

1,4

Links

Table of n, a(n) for n=1..17.

Eric Weisstein's World of Mathematics, Angle Trisection

Example

x/3 + x^3/648 + x^5/31104 + (7*x^7)/11197440 + (443*x^9)/40633270272 + ...

Crossrefs

Cf. A158600.

Sequence in context: A331338 A269555 A027876 * A009660 A024097 A203060

Adjacent sequences: A158596 A158597 A158598 * A158600 A158601 A158602

Keyword

sign,frac

Author

Eric W. Weisstein, Mar 22 2009

Status

approved