Number of circular n-letter words over the alphabet {0,1,2,3,4} with adjacent letters differing by at most 2.
A124806
Number of circular n-letter words over the alphabet {0,1,2,3,4} with adjacent letters differing by at most 2.
Terms
- a(0) =1a(1) =5a(2) =19a(3) =65a(4) =247a(5) =955a(6) =3733a(7) =14649a(8) =57583a(9) =226505a(10) =891219a(11) =3507047a(12) =13801285a(13) =54313277a(14) =213745019a(15) =841177105a(16) =3310392415a(17) =13027820227a(18) =51270096661a(19) =201769982673a(20) =794052091767
External references
- oeis: A124806