G.f. is the polynomial (1-x^3) * (1-x^6) * (1-x^9) * (1-x^12) * (1-x^15) * (1-x^18) * (1-x^21) / (1-x)^7.
A162595
G.f. is the polynomial (1-x^3) * (1-x^6) * (1-x^9) * (1-x^12) * (1-x^15) * (1-x^18) * (1-x^21) / (1-x)^7.
Terms
- a(0) =1a(1) =7a(2) =28a(3) =83a(4) =203a(5) =434a(6) =839a(7) =1499a(8) =2513a(9) =3997a(10) =6082a(11) =8911a(12) =12635a(13) =17408a(14) =23381a(15) =30696a(16) =39480a(17) =49839a(18) =61852a(19) =75565a(20) =90985a(21) =108075a(22) =126750a(23) =146874a(24) =168259a(25) =190666a(26) =213808a(27) =237355a(28) =260941a(29) =284173
External references
- oeis: A162595