Number of circular n-letter words over the alphabet {0,1,2,3} with adjacent letters differing by at most 2.
A124805
Number of circular n-letter words over the alphabet {0,1,2,3} with adjacent letters differing by at most 2.
Terms
- a(0) =1a(1) =4a(2) =14a(3) =46a(4) =162a(5) =574a(6) =2042a(7) =7270a(8) =25890a(9) =92206a(10) =328394a(11) =1169590a(12) =4165554a(13) =14835838a(14) =52838618a(15) =188187526a(16) =670239810a(17) =2387094478a(18) =8501763050a(19) =30279478102a(20) =107841960402a(21) =384084837406
External references
- oeis: A124805