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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.

A387086 Expansion of B(x)/sqrt(1 + 2*(B(x)-1)), where B(x) is the g.f. of A000984.

Table of values

n a(n)
0 1
1 0
2 2
3 4
4 16
5 52
6 188
7 672
8 2458
9 9052
10 33648
11 125864
12 473500
13 1789632
14 6791528
15 25863568
16 98796096
17 378411332
18 1452886052
19 5590262688
20 21551271916
21 83228809640
22 321933018272
23 1247062996304
24 4837152438556
25 18785529571200
26 73037938668632
27 284268423472432

List of values

[1, 0, 2, 4, 16, 52, 188, 672, 2458, 9052, 33648, 125864, 473500, 1789632, 6791528, 25863568, 98796096, 378411332, 1452886052, 5590262688, 21551271916, 83228809640, 321933018272, 1247062996304, 4837152438556, 18785529571200, 73037938668632, 284268423472432]

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

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