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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.

A210540 Number of arrays of n nonnegative integers with value i>0 appearing only after i-1 has appeared at least 3 times.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 4
6 8
7 17
8 40
9 104
10 291
11 857
12 2634
13 8455
14 28424
15 100117
16 368465
17 1410903
18 5599073
19 22968514
20 97267342
21 424927846
22 1913764155
23 8877181958
24 42358589064
25 207639979365
26 1044360973987
27 5384167878948
28 28429186870051
29 153638182314504
30 849295001319211

List of values

[1, 1, 1, 1, 2, 4, 8, 17, 40, 104, 291, 857, 2634, 8455, 28424, 100117, 368465, 1410903, 5599073, 22968514, 97267342, 424927846, 1913764155, 8877181958, 42358589064, 207639979365, 1044360973987, 5384167878948, 28429186870051, 153638182314504, 849295001319211]

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

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