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.

A303442 Expansion of Product_{k>=1} ((1 + 4^k*x^k)/(1 - 4^k*x^k))^(1/4^k).

Table of values

n a(n)
0 1
1 2
2 4
3 18
4 34
5 166
6 544
7 2222
8 5396
9 29622
10 101276
11 411206
12 1170986
13 5435466
14 20007472
15 90854146
16 253956882
17 1160301990
18 4412414972
19 18080729238
20 56012061494
21 275783908498
22 1010620487696
23 4103148863306
24 12730394683264
25 58227896627114
26 223877604671508

List of values

[1, 2, 4, 18, 34, 166, 544, 2222, 5396, 29622, 101276, 411206, 1170986, 5435466, 20007472, 90854146, 253956882, 1160301990, 4412414972, 18080729238, 56012061494, 275783908498, 1010620487696, 4103148863306, 12730394683264, 58227896627114, 223877604671508]