Number of 0..n arrays of length 3 with each element differing from at least one neighbor by something other than 1.

A221574

Number of 0..n arrays of length 3 with each element differing from at least one neighbor by something other than 1.

Terms

    a(0) =2a(1) =9a(2) =26a(3) =59a(4) =114a(5) =197a(6) =314a(7) =471a(8) =674a(9) =929a(10) =1242a(11) =1619a(12) =2066a(13) =2589a(14) =3194a(15) =3887a(16) =4674a(17) =5561a(18) =6554a(19) =7659a(20) =8882a(21) =10229a(22) =11706a(23) =13319a(24) =15074a(25) =16977a(26) =19034a(27) =21251a(28) =23634a(29) =26189

External references