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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.

A354402 a(n) is the numerator of Sum_{k=1..n} (-1)^(k+1) / (k*k!).

Table of values

n a(n)
1 1
2 3
3 29
4 229
5 5737
6 8603
7 210781
8 26979863
9 728456581
10 3642282779
11 440716217519
12 1762864869691
13 297924162982399
14 260683642609331
15 15641018556560861
16 4004100750479565401
17 1157185116888594641129
18 31243998155992054970143
19 11279083334313131850347743
20 112790833343131318500567523

List of values

[1, 3, 29, 229, 5737, 8603, 210781, 26979863, 728456581, 3642282779, 440716217519, 1762864869691, 297924162982399, 260683642609331, 15641018556560861, 4004100750479565401, 1157185116888594641129, 31243998155992054970143, 11279083334313131850347743, 112790833343131318500567523]

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

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