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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.

A209923 E.g.f. A(x) satisfies: A( x - x^2/2 - Sum_{n>=3} (n-3)!*x^n/n! ) = x.

Table of values

n a(n)
1 1
2 1
3 4
4 26
5 237
6 2778
7 39805
8 674125
9 13174189
10 291802238
11 7223963796
12 197670359937
13 5924155984714
14 192988681624915
15 6789966027406003
16 256591956638230811
17 10365414610788266136
18 445744854494435066418
19 20330276980162447348231
20 980249560154126513379574

List of values

[1, 1, 4, 26, 237, 2778, 39805, 674125, 13174189, 291802238, 7223963796, 197670359937, 5924155984714, 192988681624915, 6789966027406003, 256591956638230811, 10365414610788266136, 445744854494435066418, 20330276980162447348231, 980249560154126513379574]

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

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