E.g.f. [1-x -sqrt(1-2x-3x^2)]/(2x) - [1+x-sqrt(1-2x-3x^2)]/2 .
A052731
E.g.f. [1-x -sqrt(1-2x-3x^2)]/(2x) - [1+x-sqrt(1-2x-3x^2)]/2 .
Terms
- a(0) =0a(1) =0a(2) =0a(3) =6a(4) =48a(5) =600a(6) =8640a(7) =151200a(8) =3064320a(9) =71124480a(10) =1857945600a(11) =54007430400
External references
- oeis: A052731