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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.

A270501 Sum of the sizes of the ninth blocks in all set partitions of {1,2,...,n}.

Table of values

n a(n)
9 1
10 47
11 1267
12 25820
13 443249
14 6782968
15 95737722
16 1274661371
17 16262852622
18 201150251360
19 2433394489974
20 28994047438464
21 342194356303003
22 4019284858043011
23 47169786677194389
24 555004306379162344
25 6566292430043177959
26 78313245092235242824
27 943595956075419339524

List of values

[1, 47, 1267, 25820, 443249, 6782968, 95737722, 1274661371, 16262852622, 201150251360, 2433394489974, 28994047438464, 342194356303003, 4019284858043011, 47169786677194389, 555004306379162344, 6566292430043177959, 78313245092235242824, 943595956075419339524]

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

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