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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.

A337907 The number of walks of n steps on the hexagonal lattice that start at the origin and end at the non-adjacent vertex (3/2,sqrt(3)/2).

Table of values

n a(n)
2 2
3 6
4 48
5 220
6 1320
7 6930
8 39200
9 215208
10 1208340
11 6754440
12 38076192
13 214939296
14 1218641424
15 6925848930
16 39477746880
17 225542306704
18 1291514481972
19 7410367503396
20 42599109627360
21 245305128355560
22 1414839151645920
23 8172376003368720
24 47270088643265280
25 273766119948648000

List of values

[2, 6, 48, 220, 1320, 6930, 39200, 215208, 1208340, 6754440, 38076192, 214939296, 1218641424, 6925848930, 39477746880, 225542306704, 1291514481972, 7410367503396, 42599109627360, 245305128355560, 1414839151645920, 8172376003368720, 47270088643265280, 273766119948648000]

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

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