Number of 7-ary words either empty or beginning with the first character of the alphabet, that can be built by inserting n doublets into the initially empty word.

A194727

Number of 7-ary words either empty or beginning with the first character of the alphabet, that can be built by inserting n doublets into the initially empty word.

Terms

    a(0) =1a(1) =1a(2) =13a(3) =205a(4) =3565a(5) =65821a(6) =1265677a(7) =25066621a(8) =507709165a(9) =10466643805a(10) =218878998733

External references