cp's OEIS Frontend

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.

A378339 Number of n-node connected achiral planar maps with an external face in which all internal faces are triangles.

Table of values

n a(n)
3 1
4 2
5 5
6 15
7 46
8 139
9 449
10 1448
11 4799
12 15971
13 54107
14 184048
15 633365
16 2188644
17 7624153
18 26659774
19 93772014
20 330946542
21 1173233805
22 4171572088
23 14884905583
24 53249784377
25 191043396323
26 686956509123
27 2476044740337
28 8942288625630
29 32360306616473
30 117309644377341

List of values

[1, 2, 5, 15, 46, 139, 449, 1448, 4799, 15971, 54107, 184048, 633365, 2188644, 7624153, 26659774, 93772014, 330946542, 1173233805, 4171572088, 14884905583, 53249784377, 191043396323, 686956509123, 2476044740337, 8942288625630, 32360306616473, 117309644377341]

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

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