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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.

A367775 a(n) = Sum_{k=0..n} (-1)^(n - k) * A011971(n, k).

Table of values

n a(n)
0 1
1 1
2 4
3 7
4 37
5 94
6 587
7 1925
8 13606
9 54217
10 424381
11 1979704
12 16918869
13 90086877
14 831972372
15 4964577987
16 49154794969
17 324183365662
18 3419501188439
19 24655458609377
20 275624716500750
21 2153735319395661
22 25406228456463665
23 213606545948092304
24 2649077873736448473

List of values

[1, 1, 4, 7, 37, 94, 587, 1925, 13606, 54217, 424381, 1979704, 16918869, 90086877, 831972372, 4964577987, 49154794969, 324183365662, 3419501188439, 24655458609377, 275624716500750, 2153735319395661, 25406228456463665, 213606545948092304, 2649077873736448473]

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

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