21457825
domain: N
Appears in sequences
- Stirling numbers of second kind S(n,3).at n=17A000392
- Stirling numbers of second kind S2(17,n).at n=2A011566
- Number of primitive (aperiodic) word structures of length n which contain exactly three different symbols.at n=16A056279
- Number of periodic palindromic structures of length n using exactly three different symbols.at n=32A056509