A218477 - cp's OEIS frontend

A218477 Number of 3n-length 7-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.

n	a(n)
0	1
1	1
2	19
3	469
4	13123
5	395461
6	12517939
7	410380885
8	13811907043
9	474457464613
10	16567069507219
11	586287339402997
12	20980966876537411
13	757961579781924805
14	27605221102084999411
15	1012488016842242735509
16	37364825362229946450595
17	1386427393386051832383589

[1, 1, 19, 469, 13123, 395461, 12517939, 410380885, 13811907043, 474457464613, 16567069507219, 586287339402997, 20980966876537411, 757961579781924805, 27605221102084999411, 1012488016842242735509, 37364825362229946450595, 1386427393386051832383589]

cp's OEIS Frontend

A218477 Number of 3n-length 7-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.

Table of values

List of values