A195569 Numerators b(n) of Pythagorean approximations b(n)/a(n) to 7/4.

4, 15, 209, 1116, 3807, 53985, 287844, 982255, 13927857, 74262716, 253417919, 3593333185, 19159492804, 65380840911, 927066033809, 4943074880796, 16868003537055, 239179443389601, 1275294159752484, 4351879531719343, 61707369328483185

Offset: 1

Author

Clark Kimberling, Sep 21 2011

Keywords

• nonn

Comments

See A195500 for discussion and list of related sequences; see A195568 for Mathematica program.

Crossrefs

Cf. A195500, A195568, A195570.

Formula

Empirical g.f.: -x*(x^8-x^7-4*x^6-272*x^5+48*x^4-88*x^3-209*x^2-15*x-4) / (x^9-257*x^6-257*x^3+1). - Colin Barker, Jun 04 2015