Number of compositions of n into distinct parts where each part i is marked with a word of length i over a quaternary alphabet whose letters appear in alphabetical order and all letters occur at least once in the composition.
A261855
Number of compositions of n into distinct parts where each part i is marked with a word of length i over a quaternary alphabet whose letters appear in alphabetical order and all letters occur at least once in the composition.
Terms
- a(0) =9a(1) =92a(2) =1562a(3) =3908a(4) =14791a(5) =50208a(6) =540552a(7) =987120a(8) =3138143a(9) =7862580a(10) =23436690a(11) =204455140a(12) =349297653a(13) =956040232a(14) =2228084512a(15) =5599922904a(16) =13449425997a(17) =116772809532a(18) =182990434794a(19) =483410072060
External references
- oeis: A261855