A260851 - cp's OEIS frontend

A260851 a(n) in base n is the concatenation of the base n expansions of (1, 2, 3, ..., n-1, n, n-1, ..., 3, 2, 1).

n	a(n)
1	1
2	13
3	439
4	27961
5	3034961
6	522134761
7	131870760799
8	45954960939217
9	21107054541321649
10	12345678910987654321
11	8954302429379707945271
12	7883984846509322664831433
13	8281481197999449959084458465
14	10228838696316240496325238416281
15	14674825961700306151086890240104831

[1, 13, 439, 27961, 3034961, 522134761, 131870760799, 45954960939217, 21107054541321649, 12345678910987654321, 8954302429379707945271, 7883984846509322664831433, 8281481197999449959084458465, 10228838696316240496325238416281, 14674825961700306151086890240104831]

cp's OEIS Frontend

A260851 a(n) in base n is the concatenation of the base n expansions of (1, 2, 3, ..., n-1, n, n-1, ..., 3, 2, 1).

Table of values

List of values