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^30) * (1-x^33) * (1-x^36) * (1-x^39) * (1-x^42) * (1-x^45) / (1-x)^15.
A162635
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^30) * (1-x^33) * (1-x^36) * (1-x^39) * (1-x^42) * (1-x^45) / (1-x)^15.
Terms
- a(0) =1a(1) =15a(2) =120a(3) =679a(4) =3045a(5) =11508a(6) =38079a(7) =113205a(8) =308022a(9) =777750a(10) =1841916a(11) =4126002a(12) =8801750a(13) =17980764a(14) =35339430a(15) =67083871a(16) =123403134a(17) =220608645a(18) =384219820a(19) =653331285a(20) =1086688143a(21) =1771003801a(22) =2832181620a(23) =4450248525a(24) =6878976970
External references
- oeis: A162635