Numerator of Maclaurin expansion of (t*sqrt(t^2+1) + arcsinh(t))/2, the arc length of Archimedes' spiral.

A091154

Numerator of Maclaurin expansion of (t*sqrt(t^2+1) + arcsinh(t))/2, the arc length of Archimedes' spiral.

Terms

    a(0) =1a(1) =1a(2) =-1a(3) =1a(4) =-5a(5) =7a(6) =-21a(7) =11a(8) =-429a(9) =715a(10) =-2431a(11) =4199a(12) =-29393a(13) =52003a(14) =-185725a(15) =334305a(16) =-3231615a(17) =3535767a(18) =-64822395a(19) =39803225a(20) =-883631595a(21) =1641030105a(22) =-407771117a(23) =11435320455a(24) =-171529806825a(25) =107492012277

External references