Number of strings of length n over a 5-letter alphabet that do not begin with a palindrome.
A252698
Number of strings of length n over a 5-letter alphabet that do not begin with a palindrome.
Terms
- a(0) =0a(1) =5a(2) =20a(3) =80a(4) =380a(5) =1820a(6) =9020a(7) =44720a(8) =223220a(9) =1114280a(10) =5569580a(11) =27838880a(12) =139185380a(13) =695882180a(14) =3479366180a(15) =17396607680a(16) =86982815180a(17) =434912961620
External references
- oeis: A252698