G.f. is the polynomial (Product_{k=1..25} (1 - x^(3*k)))/(1-x)^25.
A162702
G.f. is the polynomial (Product_{k=1..25} (1 - x^(3*k)))/(1-x)^25.
Terms
- a(0) =1a(1) =25a(2) =325a(3) =2924a(4) =20450a(5) =118430a(6) =590849a(7) =2609075a(8) =10399220a(9) =37970400a(10) =128478090a(11) =406588845a(12) =1212516825a(13) =3428709585a(14) =9241809900a(15) =23850595861a(16) =59158506235a(17) =141497700775a(18) =327304605615a(19) =734057883375
External references
- oeis: A162702