A258494 - cp's OEIS frontend

A258494 Number of words of length 2n such that all letters of the septenary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting doublets into the initially empty word.

n	a(n)
7	429
8	32032
9	1447992
10	51647700
11	1605746373
12	45730269662
13	1227377689395
14	31600247019120
15	789604855530855
16	19302666179660304
17	464277874912868104
18	11032638071392824348
19	259801742258903758053
20	6076538940891732415102
21	141407795779400734204647

[429, 32032, 1447992, 51647700, 1605746373, 45730269662, 1227377689395, 31600247019120, 789604855530855, 19302666179660304, 464277874912868104, 11032638071392824348, 259801742258903758053, 6076538940891732415102, 141407795779400734204647]

cp's OEIS Frontend

A258494 Number of words of length 2n such that all letters of the septenary alphabet occur at least once and are introduced in ascending order and which can be built by repeatedly inserting doublets into the initially empty word.

Table of values

List of values