A194723 - cp's OEIS frontend

A194723 Number of ternary 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.

n	a(n)
0	1
1	1
2	5
3	29
4	181
5	1181
6	7941
7	54573
8	381333
9	2699837
10	19319845
11	139480397
12	1014536117
13	7426790749
14	54669443141
15	404388938349
16	3004139083221
17	22402851226749
18	167640057210981
19	1258340276153229
20	9471952718661621
21	71481616200910749
22	540715584181142661

[1, 1, 5, 29, 181, 1181, 7941, 54573, 381333, 2699837, 19319845, 139480397, 1014536117, 7426790749, 54669443141, 404388938349, 3004139083221, 22402851226749, 167640057210981, 1258340276153229, 9471952718661621, 71481616200910749, 540715584181142661]

cp's OEIS Frontend

A194723 Number of ternary 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.

Table of values

List of values