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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.

A321968 a(n) = 2^n*n!*[x^n] -sqrt(exp(LambertW(-x)))*(LambertW(-x) + 1).

Table of values

n a(n)
0 -1
1 3
2 7
3 55
4 735
5 13851
6 336743
7 10024911
8 353109375
9 14361853555
10 662358958599
11 34154042002983
12 1947046027041503
13 121593475341796875
14 8255204941334951655
15 605377094064557529151
16 47687467918910168180223
17 4015909348423983176411619

List of values

[-1, 3, 7, 55, 735, 13851, 336743, 10024911, 353109375, 14361853555, 662358958599, 34154042002983, 1947046027041503, 121593475341796875, 8255204941334951655, 605377094064557529151, 47687467918910168180223, 4015909348423983176411619]

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

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