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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.

A258457 Number of partitions of n into parts of exactly 2 sorts which are introduced in ascending order.

Table of values

n a(n)
2 1
3 4
4 12
5 30
6 72
7 160
8 351
9 743
10 1561
11 3219
12 6616
13 13456
14 27312
15 55139
16 111166
17 223472
18 448902
19 900305
20 1804838
21 3615137
22 7239325
23 14490368
24 29000050
25 58025059
26 116090823
27 232234573
28 464554483
29 929220024
30 1858618215
31 3717468189
32 7435305664
33 14871092926

List of values

[1, 4, 12, 30, 72, 160, 351, 743, 1561, 3219, 6616, 13456, 27312, 55139, 111166, 223472, 448902, 900305, 1804838, 3615137, 7239325, 14490368, 29000050, 58025059, 116090823, 232234573, 464554483, 929220024, 1858618215, 3717468189, 7435305664, 14871092926]

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

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