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.

A204275 G.f.: Product_{n>=1} (1 + A002203(n)*x^n + (-1)^n*x^(2*n)) where A002203 is the companion Pell numbers.

Table of values

n a(n)
0 1
1 2
2 5
3 26
4 57
5 222
6 698
7 2096
8 6038
9 19730
10 58915
11 169952
12 516024
13 1484958
14 4397513
15 13029558
16 37094682
17 106442928
18 311875984
19 879620854
20 2522107990
21 7229956352
22 20398904648
23 57543374566
24 163053304047
25 457604617760
26 1283583473614
27 3606627675050

List of values

[1, 2, 5, 26, 57, 222, 698, 2096, 6038, 19730, 58915, 169952, 516024, 1484958, 4397513, 13029558, 37094682, 106442928, 311875984, 879620854, 2522107990, 7229956352, 20398904648, 57543374566, 163053304047, 457604617760, 1283583473614, 3606627675050]