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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.

A336805 a(n) = (n!)^2 * Sum_{k=0..n} 3^(n-k) / (k!)^2.

Table of values

n a(n)
0 1
1 4
2 49
3 1324
4 63553
5 4766476
6 514779409
7 75672573124
8 14529134039809
9 3530579571673588
10 1059173871502076401
11 384480115355253733564
12 166095409833469612899649
13 84210372785569093740122044
14 49515699197914627119191761873
15 33423096958592373305454439264276
16 25668938464198942698589009354963969

List of values

[1, 4, 49, 1324, 63553, 4766476, 514779409, 75672573124, 14529134039809, 3530579571673588, 1059173871502076401, 384480115355253733564, 166095409833469612899649, 84210372785569093740122044, 49515699197914627119191761873, 33423096958592373305454439264276, 25668938464198942698589009354963969]

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

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