G.f.: x^2*(x-1)^8/(4*x^9+x^8-79*x^7+166*x^6-225*x^5+206*x^4-129*x^3+50*x^2-11*x+1).
A061706
G.f.: x^2*(x-1)^8/(4*x^9+x^8-79*x^7+166*x^6-225*x^5+206*x^4-129*x^3+50*x^2-11*x+1).
Terms
- a(0) =0a(1) =0a(2) =1a(3) =3a(4) =11a(5) =44a(6) =185a(7) =805a(8) =3552a(9) =15671a(10) =68827a(11) =301108a(12) =1314553a(13) =5735237a(14) =25024104a(15) =109216135a(16) =476775195a(17) =2081568940a(18) =9088283129a(19) =39679791093a(20) =173240442512a(21) =756351086215
External references
- oeis: A061706