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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.

A380996 a(n) is the number of vertices in the n-fold iterated barycentric subdivision of a triangle (or 2-simplex).

Table of values

n a(n)
0 3
1 7
2 25
3 121
4 673
5 3937
6 23425
7 140161
8 840193
9 5039617
10 30234625
11 181401601
12 1088397313
13 6530359297
14 39182106625
15 235092541441
16 1410555052033
17 8463329918977
18 50779978727425
19 304679870791681
20 1828079221604353
21 10968475323334657
22 65810851927425025
23 394865111539384321

List of values

[3, 7, 25, 121, 673, 3937, 23425, 140161, 840193, 5039617, 30234625, 181401601, 1088397313, 6530359297, 39182106625, 235092541441, 1410555052033, 8463329918977, 50779978727425, 304679870791681, 1828079221604353, 10968475323334657, 65810851927425025, 394865111539384321]

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

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