cp's OEIS Frontend

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.

A285917 Number of ordered set partitions of [n] into two blocks such that equal-sized blocks are ordered with increasing least elements.

Table of values

n a(n)
2 1
3 6
4 11
5 30
6 52
7 126
8 219
9 510
10 896
11 2046
12 3632
13 8190
14 14666
15 32766
16 59099
17 131070
18 237832
19 524286
20 956196
21 2097150
22 3841586
23 8388606
24 15425136
25 33554430
26 61908562
27 134217726
28 248377154
29 536870910
30 996183062
31 2147483646
32 3994427099
33 8589934590
34 16013066072

List of values

[1, 6, 11, 30, 52, 126, 219, 510, 896, 2046, 3632, 8190, 14666, 32766, 59099, 131070, 237832, 524286, 956196, 2097150, 3841586, 8388606, 15425136, 33554430, 61908562, 134217726, 248377154, 536870910, 996183062, 2147483646, 3994427099, 8589934590, 16013066072]

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

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