42065

Appears in sequences

• Expansion of log(1+tan(x)/cosh(x)).at n=9A009381
• arctan(sec(x)*tanh(x))=x-1/3!*x^3+25/5!*x^5-761/7!*x^7+42065/9!*x^9...at n=4A012835
• Expansion of e.g.f. log(cosh(x) + tan(x)).at n=9A013187
• Number of connected switching classes of signed graphs with n nodes.at n=6A084565
• G.f.: C - Z; where C is the g.f. for the Catalan numbers (A000108) and Z is the g.f. for A055113 with offset 0.at n=11A111160
• Array a(n,m) = ((n+2)/2)^m*Sum_{k=1..n+1} 1/sin(k*Pi/(n+2))^(2m), n>=0, k>=0, read by ascending antidiagonals.at n=40A247239