sech(tanh(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-90/6!*x^6+420/7!*x^7...
A012658
sech(tanh(x)*log(x+1))=1-12/4!*x^4+60/5!*x^5-90/6!*x^6+420/7!*x^7...
Terms
- a(0) =1a(1) =0a(2) =0a(3) =0a(4) =-12a(5) =60a(6) =-90a(7) =420a(8) =-2240a(9) =-56448a(10) =607320a(11) =-1834800a(12) =23242824a(13) =-229079136a(14) =-4388159776a(15) =77755073760a(16) =-443094745600
External references
- oeis: A012658