A218472 - cp's OEIS frontend

A218472 Number of 3n-length n-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	4
3	61
4	1810
5	82593
6	5153626
7	410380885
8	39868799482
9	4579454148865
10	607729841261560
11	91553310170011501
12	15441283593044256696
13	2883254656878648757729
14	590578881927993264483880
15	131681888589427990097216549
16	31753512197914767223878851626

[1, 1, 4, 61, 1810, 82593, 5153626, 410380885, 39868799482, 4579454148865, 607729841261560, 91553310170011501, 15441283593044256696, 2883254656878648757729, 590578881927993264483880, 131681888589427990097216549, 31753512197914767223878851626]

cp's OEIS Frontend

A218472 Number of 3n-length n-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