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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.

A273953 E.g.f. satisfies A(x) = Sum_{n>=0} x^n/n! * exp(n/2*x) * A(x)^(n/2).

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 77
5 581
6 5347
7 58213
8 732937
9 10487737
10 168217811
11 2990748509
12 58397418037
13 1242643927357
14 28627000014355
15 709933328752981
16 18859531958840273
17 534365880859577777
18 16087267158157316323
19 512844446937529664173
20 17259468942471032848861
21 611530055485070740134901
22 22755171133646348369448323
23 887228501593124485460914373
24 36173480392953890421156056665
25 1539307965110263598673884269801
26 68247672532254821767545000249907

List of values

[1, 1, 3, 13, 77, 581, 5347, 58213, 732937, 10487737, 168217811, 2990748509, 58397418037, 1242643927357, 28627000014355, 709933328752981, 18859531958840273, 534365880859577777, 16087267158157316323, 512844446937529664173, 17259468942471032848861, 611530055485070740134901, 22755171133646348369448323, 887228501593124485460914373, 36173480392953890421156056665, 1539307965110263598673884269801, 68247672532254821767545000249907]

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