Number of strings of length n over a 7-letter alphabet that begin with a nontrivial palindrome.
A249640
Number of strings of length n over a 7-letter alphabet that begin with a nontrivial palindrome.
Terms
- a(0) =0a(1) =0a(2) =7a(3) =91a(4) =679a(5) =5005a(6) =35287a(7) =248731a(8) =1742839a(9) =12211675a(10) =85493527a(11) =598537051a(12) =4189841719a(13) =29329466845a(14) =205306842727
External references
- oeis: A249640