A194724 - cp's OEIS frontend

A194724 Number of quaternary 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	7
3	58
4	523
5	4966
6	48838
7	492724
8	5068915
9	52955950
10	560198962
11	5987822380
12	64563867454
13	701383563388
14	7668869344108
15	84326618668648
16	931894610845123
17	10344218506421758
18	115280448164645818
19	1289346114476360188
20	14467472108268263818
21	162816535672067515828

[1, 1, 7, 58, 523, 4966, 48838, 492724, 5068915, 52955950, 560198962, 5987822380, 64563867454, 701383563388, 7668869344108, 84326618668648, 931894610845123, 10344218506421758, 115280448164645818, 1289346114476360188, 14467472108268263818, 162816535672067515828]

cp's OEIS Frontend

A194724 Number of quaternary 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