A281254 - cp's OEIS frontend

A281254 Concatenate the decimal numbers n n-2 n-4 ...5 3 1 2 4 ... n-5 n-3 n-1 if n is odd, or n n-2 n-4 ... 6 4 2 1 3 5 ... n-5 n-3 n-1 if n is even.

n	a(n)
1	1
2	21
3	312
4	4213
5	53124
6	642135
7	7531246
8	86421357
9	975312468
10	10864213579
11	1197531246810
12	121086421357911
13	13119753124681012
14	1412108642135791113
15	151311975312468101214
16	16141210864213579111315
17	1715131197531246810121416

[1, 21, 312, 4213, 53124, 642135, 7531246, 86421357, 975312468, 10864213579, 1197531246810, 121086421357911, 13119753124681012, 1412108642135791113, 151311975312468101214, 16141210864213579111315, 1715131197531246810121416]

cp's OEIS Frontend

A281254 Concatenate the decimal numbers n n-2 n-4 ...5 3 1 2 4 ... n-5 n-3 n-1 if n is odd, or n n-2 n-4 ... 6 4 2 1 3 5 ... n-5 n-3 n-1 if n is even.

Table of values

List of values