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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.

A111420 a(n) = Sum_{q=0..n} Stirling2(n+1,q)^2*q!.

Table of values

n a(n)
0 0
1 1
2 19
3 315
4 6601
5 178923
6 6161065
7 262268499
8 13470911521
9 818285112123
10 57836073876505
11 4693152951066099
12 432360761046527041
13 44794795435021490043
14 5176959026638375267225
15 662704551819559746282579
16 93384393940399990403502241
17 14406589076081640590750974203

List of values

[0, 1, 19, 315, 6601, 178923, 6161065, 262268499, 13470911521, 818285112123, 57836073876505, 4693152951066099, 432360761046527041, 44794795435021490043, 5176959026638375267225, 662704551819559746282579, 93384393940399990403502241, 14406589076081640590750974203]

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

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