A239375 Number of words of length n over the alphabet {0, ..., n-1} that avoid the pattern 1221.

1, 1, 4, 27, 250, 2915, 40766, 662494, 12236190, 252664815, 5759288044, 143463453199, 3873471153366, 112587628893480

Offset: 0

Author

Chad Brewbaker, Mar 17 2014

Keywords

• nonn
• more

Crossrefs

Cf. A239295.

Extensions

a(8)-a(13) from Martin Ehrenstein, Dec 03 2023