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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.

A346271 Sum_{n>=0} a(n) * x^n / (n!)^2 = exp( BesselI(0,2*sqrt(x)) - 1 - x^2 / 4 ).

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 41
5 346
6 3807
7 53747
8 952275
9 20362552
10 515112983
11 15277888693
12 523304644304
13 20415373547609
14 900219731675981
15 44533809102813206
16 2451041479421900803
17 149140880201760643360
18 9982798939295116151967
19 731215136812226462200109
20 58333374310397488522052976

List of values

[1, 1, 2, 7, 41, 346, 3807, 53747, 952275, 20362552, 515112983, 15277888693, 523304644304, 20415373547609, 900219731675981, 44533809102813206, 2451041479421900803, 149140880201760643360, 9982798939295116151967, 731215136812226462200109, 58333374310397488522052976]

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

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