Number of strings of length n composed of symbols from the circular list [1,2,3,4,5,6] such that adjacent symbols in the string must be adjacent in the list. No runs of length 2 or more are allowed for symbols 1, 3 and 5.
A277237
Number of strings of length n composed of symbols from the circular list [1,2,3,4,5,6] such that adjacent symbols in the string must be adjacent in the list. No runs of length 2 or more are allowed for symbols 1, 3 and 5.
Terms
- a(0) =1a(1) =6a(2) =15a(3) =39a(4) =99a(5) =255a(6) =651a(7) =1671a(8) =4275a(9) =10959a(10) =28059a(11) =71895a(12) =184131a(13) =471711a(14) =1208235a(15) =3095079a(16) =7928019a(17) =20308335a(18) =52020411a(19) =133253751a(20) =341335395a(21) =874350399a(22) =2239691979a(23) =5737093575a(24) =14695861491a(25) =37644235791a(26) =96427681755a(27) =247004624919a(28) =632715351939
External references
- oeis: A277237