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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.

A193274 a(n) = binomial(Bell(n), 2) where B(n) = Bell numbers A000110(n).

Table of values

n a(n)
0 0
1 0
2 1
3 10
4 105
5 1326
6 20503
7 384126
8 8567730
9 223587231
10 6725042325
11 230228283165
12 8877197732406
13 382107434701266
14 18221275474580181
15 956287167902779240
16 54916689705422813731
17 3433293323775503064306
18 232614384749689991763561
19 17010440815323680947084096

List of values

[0, 0, 1, 10, 105, 1326, 20503, 384126, 8567730, 223587231, 6725042325, 230228283165, 8877197732406, 382107434701266, 18221275474580181, 956287167902779240, 54916689705422813731, 3433293323775503064306, 232614384749689991763561, 17010440815323680947084096]

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

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