O.g.f: -12*x^3/(-1+x)/(-1+2*x)/(-1+3*x) = -2-2/(-1+3*x)-6/(-1+x)+6/(-1+2*x) .
A118979
O.g.f: -12*x^3/(-1+x)/(-1+2*x)/(-1+3*x) = -2-2/(-1+3*x)-6/(-1+x)+6/(-1+2*x) .
Terms
- a(0) =12a(1) =72a(2) =300a(3) =1080a(4) =3612a(5) =11592a(6) =36300a(7) =111960a(8) =342012a(9) =1038312a(10) =3139500a(11) =9467640a(12) =28501212a(13) =85700232a(14) =257493900a(15) =773268120a(16) =2321377212a(17) =6967277352a(18) =20908123500a(19) =62736953400a(20) =188236026012a(21) =564758409672
External references
- oeis: A118979