A248828 - cp's OEIS frontend

A248828 Number of 2n-length words, either empty or beginning with the first character of an n-ary alphabet, that can be built by repeatedly inserting doublets into the initially empty word.

n	a(n)
0	1
1	1
2	3
3	29
4	523
5	14289
6	530526
7	25066621
8	1443039123
9	98156060225
10	7711583225338
11	687676559089101
12	68652814486950398
13	7588068106131457489
14	920064964125791788188
15	121445943726500589053565
16	17337678537189658091486851
17	2661994674815094376005234945

[1, 1, 3, 29, 523, 14289, 530526, 25066621, 1443039123, 98156060225, 7711583225338, 687676559089101, 68652814486950398, 7588068106131457489, 920064964125791788188, 121445943726500589053565, 17337678537189658091486851, 2661994674815094376005234945]

cp's OEIS Frontend

A248828 Number of 2n-length words, either empty or beginning with the first character of an n-ary alphabet, that can be built by repeatedly inserting doublets into the initially empty word.

Table of values

List of values