G.f. is the polynomial (Product_{k=1..27} (1 - x^(3*k)))/(1-x)^27.
A162726
G.f. is the polynomial (Product_{k=1..27} (1 - x^(3*k)))/(1-x)^27.
Terms
- a(0) =1a(1) =27a(2) =378a(3) =3653a(4) =27378a(5) =169533a(6) =902537a(7) =4244616a(8) =17985915a(9) =69697614a(10) =249887403a(11) =836666037a(12) =2635961496a(13) =7863966540a(14) =22333781484a(15) =60654192289a(16) =158133109329a(17) =397109727144a(18) =963390950574
External references
- oeis: A162726