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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.

A381143 Expansion of e.g.f. (1/x) * Series_Reversion( x * exp(-x * cosh(x)) ).

Table of values

n a(n)
0 1
1 1
2 3
3 19
4 185
5 2381
6 38227
7 739271
8 16752465
9 435437209
10 12772234211
11 417396070235
12 15040805940745
13 592531894182437
14 25336144876513395
15 1168670193628654351
16 57845446906144852769
17 3058248577410499021361
18 172007282950136451003331
19 10255035157348348977955619

List of values

[1, 1, 3, 19, 185, 2381, 38227, 739271, 16752465, 435437209, 12772234211, 417396070235, 15040805940745, 592531894182437, 25336144876513395, 1168670193628654351, 57845446906144852769, 3058248577410499021361, 172007282950136451003331, 10255035157348348977955619]

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

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