Number of 3n-length 10-ary words, either empty or beginning with the first letter of the alphabet, that can be built by repeatedly inserting triples of identical letters into the initially empty word.
A218480
Number of 3n-length 10-ary words, either empty or beginning with the first letter of the alphabet, that can be built by repeatedly inserting triples of identical letters into the initially empty word.
Terms
- a(0) =1a(1) =1a(2) =28a(3) =1027a(4) =42850a(5) =1929043a(6) =91320022a(7) =4480436836a(8) =225785025802
External references
- oeis: A218480