Number of multisets of exactly four nonempty words with a total of n letters over n-ary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
A294006
Number of multisets of exactly four nonempty words with a total of n letters over n-ary alphabet such that within each prefix of a word every letter of the alphabet is at least as frequent as the subsequent alphabet letter.
Terms
- a(0) =1a(1) =2a(2) =7a(3) =22a(4) =73a(5) =234a(6) =791a(7) =2702a(8) =9507a(9) =34258a(10) =126807a(11) =482306a(12) =1885031a(13) =7578028a(14) =31316391a(15) =133117500a(16) =581531653a(17) =2611112712a(18) =12037781812a(19) =56962049532a(20) =276345797775
External references
- oeis: A294006