A092677 Denominators of coefficients in the series for inverf(2x/sqrt(Pi)).

1, 3, 30, 630, 22680, 178200, 97297200, 10216206000, 198486288000, 237588086736000, 49893498214560000, 1803293578326240000, 222759794969712000000, 1329207696584271504000000

Offset: 1

Author

Eric W. Weisstein, Mar 02 2004

Keywords

• nonn

Comments

Differs from A007019(n) at n = 6, 9, 12, ....

Examples

			inverf(2x/sqrt(Pi)) = x + x^3/3 + 7x^5/30 + 127x^7/630 + 4369x^9/22680 + 34807x^11/178200 + ...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 1..235
• G. Alkauskas, Algebraic and abelian solutions to the projective translation equation, arXiv preprint arXiv:1506.08028 [math.AG], 2015-2016; Aequationes Math. 90 (4) (2016), 727-763.
• J. M. Blair, C. A. Edwards and J. H. Johnson, Rational Chebyshev approximations for the inverse of the error function, Math. Comp. 30 (1976), 827-830.
• L. Carlitz, The inverse of the error function, Pacific J. Math., 13 (1963), 459-470.
• Eric Weisstein, Mathematica program and first 50 terms of the series
• Eric Weisstein's World of Mathematics, Inverse Erf

Crossrefs

Cf. A007019, A092677.

Programs

Mathematica

Denominator[CoefficientList[Series[InverseErf[2*x/Sqrt[Pi]], {x, 0, 50}],
x]][[2 ;; ;; 2]] (* G. C. Greubel, Jan 09 2017 *)