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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.

A296941 Expansion of e.g.f. arcsin(x*tan(x/2)) (even powers only).

Table of values

n a(n)
0 0
1 1
2 1
3 18
4 227
5 12125
6 542448
7 55071205
8 5492843269
9 905996551626
10 159770279801855
11 39299019878991521
12 10721872262093222016
13 3707660329253983397113
14 1438816154956071399594457
15 668949924061617421125859650
16 348908555505788456739965412203

List of values

[0, 1, 1, 18, 227, 12125, 542448, 55071205, 5492843269, 905996551626, 159770279801855, 39299019878991521, 10721872262093222016, 3707660329253983397113, 1438816154956071399594457, 668949924061617421125859650, 348908555505788456739965412203]

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

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