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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A260866 Base-16 representation of a(n) is the concatenation of the base-16 representations of 1, 2, ..., n, n-1, ..., 1.

Table of values

n a(n)
0 0
1 1
2 289
3 74529
4 19088161
5 4886709025
6 1250999747361
7 320255971115809
8 81985529178309409
9 20988295478809805601
10 5373003642721911784225
11 1375488932539155041567521
12 352125166730061220638180129
13 90144042682896272963324429089
14 23076874926821455486290258903841

List of values

[0, 1, 289, 74529, 19088161, 4886709025, 1250999747361, 320255971115809, 81985529178309409, 20988295478809805601, 5373003642721911784225, 1375488932539155041567521, 352125166730061220638180129, 90144042682896272963324429089, 23076874926821455486290258903841]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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