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.

A384272 G.f. A(x) satisfies -2*x = Product_{n>=1} (1 - x^n/A(x)) * (1 - x^(n-1)*A(x)) * (1 + x^n).

Table of values

n a(n)
0 1
1 2
2 2
3 6
4 16
5 50
6 144
7 478
8 1510
9 5116
10 17034
11 58812
12 202166
13 709228
14 2489546
15 8848146
16 31525526
17 113236920
18 407983964
19 1478249454
20 5372468156
21 19607233026
22 71758722172
23 263480958508
24 969856453650
25 3579426292768
26 13239549874552
27 49078409375334
28 182282423994240
29 678289439131812
30 2528257204808848

List of values

[1, 2, 2, 6, 16, 50, 144, 478, 1510, 5116, 17034, 58812, 202166, 709228, 2489546, 8848146, 31525526, 113236920, 407983964, 1478249454, 5372468156, 19607233026, 71758722172, 263480958508, 969856453650, 3579426292768, 13239549874552, 49078409375334, 182282423994240, 678289439131812, 2528257204808848]