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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.

A343709 a(n) = 1 + 3 * Sum_{k=0..n-1} binomial(n,k) * (n-k-1)! * a(k).

Table of values

n a(n)
0 1
1 4
2 28
3 295
4 4159
5 73348
6 1552468
7 38336569
8 1081926157
9 34350646636
10 1211796777748
11 47023762576987
12 1990643657768683
13 91291802205304972
14 4508735102829489580
15 238583762726054522989
16 13466532093135977880025
17 807606110028529741369396
18 51282242176105846536128236

List of values

[1, 4, 28, 295, 4159, 73348, 1552468, 38336569, 1081926157, 34350646636, 1211796777748, 47023762576987, 1990643657768683, 91291802205304972, 4508735102829489580, 238583762726054522989, 13466532093135977880025, 807606110028529741369396, 51282242176105846536128236]

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

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