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^24) * (1-x^27) / (1-x)^9.
A162602
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^24) * (1-x^27) / (1-x)^9.
Terms
- a(0) =1a(1) =9a(2) =45a(3) =164a(4) =486a(5) =1242a(6) =2837a(7) =5931a(8) =11538a(9) =21142a(10) =36828a(11) =61425a(12) =98657a(13) =153297a(14) =231318a(15) =340035a(16) =488232a(17) =686268a(18) =946156a(19) =1281609a(20) =1708047a(21) =2242560a(22) =2903823a(23) =3711960a(24) =4688355a(25) =5855409a(26) =7236243a(27) =8854348a(28) =10733184a(29) =12895731
External references
- oeis: A162602