Expansion of e.g.f. exp(x)*(1 + x + x^2/2)*(sec(x) + tan(x)).
A308520
Expansion of e.g.f. exp(x)*(1 + x + x^2/2)*(sec(x) + tan(x)).
Terms
- a(0) =1a(1) =3a(2) =9a(3) =27a(4) =84a(5) =287a(6) =1116a(7) =4984a(8) =25368a(9) =145277a(10) =924684a(11) =6475018a(12) =49464756a(13) =409371731a(14) =3648595216a(15) =34841512504a(16) =354892721168
External references
- oeis: A308520