Expansion of g.f.: (-1 + sqrt(1+12*x+48*x^2)) / (6*x).
A240880
Expansion of g.f.: (-1 + sqrt(1+12*x+48*x^2)) / (6*x).
Terms
- a(0) =1a(1) =1a(2) =-6a(3) =33a(4) =-162a(5) =666a(6) =-1836a(7) =-2079a(8) =79542a(9) =-741474a(10) =4907628a(11) =-24837030a(12) =82449900a(13) =53319060a(14) =-3741922008a(15) =38613958497a(16) =-274566158298
External references
- oeis: A240880