Number of compositions of n where each part i is marked with a word of length i over a ternary alphabet whose letters appear in alphabetical order and all three letters occur at least once in the composition.
A293580
Number of compositions of n where each part i is marked with a word of length i over a ternary alphabet whose letters appear in alphabetical order and all three letters occur at least once in the composition.
Terms
- a(0) =13a(1) =132a(2) =924a(3) =5546a(4) =30720a(5) =162396a(6) =834004a(7) =4204080a(8) =20932656a(9) =103365416a(10) =507538320a(11) =2482394448a(12) =12108785680a(13) =58954149792a(14) =286654114176
External references
- oeis: A293580