A235352 Series reversion of x*(1+3*x^2)/(1+x^2) in odd-power terms.

1, -2, 14, -130, 1382, -15906, 192894, -2427522, 31405430, -415086658, 5580629870, -76080887042, 1049295082630, -14613980359010, 205246677882078, -2903566870820610, 41337029956899222, -591796707042765954, 8514525059135909070, -123048063153362454402

Offset: 0

Author

Fung Lam, Jan 16 2014

Keywords

• sign
• easy

Comments

Conjugate turbulence sequence to A235347.

Links

• Georg Fischer, Table of n, a(n) for n = 0..1000 (first 939 terms from _Fung Lam_)

Crossrefs

Cf. A235347.

Formula

D-finite with recurrence 12*n*(2*n+1)*a(n) +(382*n^2-391*n+90)*a(n-1) +3*(34*n^2-132*n+125)*a(n-2) +(2*n-5)*(n-3)*a(n-3)=0. - R. J. Mathar, Mar 24 2023