A007907 - cp's OEIS frontend

A007907 Concatenation of sequence (1, 2, ..., floor((n-1)/2), floor(n/2), floor(n/2)-1, ..., 1) for n >= 1.

n	a(n)
1	1
2	11
3	121
4	1221
5	12321
6	123321
7	1234321
8	12344321
9	123454321
10	1234554321
11	12345654321
12	123456654321
13	1234567654321
14	12345677654321
15	123456787654321
16	1234567887654321
17	12345678987654321

[1, 11, 121, 1221, 12321, 123321, 1234321, 12344321, 123454321, 1234554321, 12345654321, 123456654321, 1234567654321, 12345677654321, 123456787654321, 1234567887654321, 12345678987654321]

cp's OEIS Frontend

A007907 Concatenation of sequence (1, 2, ..., floor((n-1)/2), floor(n/2), floor(n/2)-1, ..., 1) for n >= 1.

Table of values

List of values