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.

A355345 G.f.: Sum_{n=-oo..+oo} x^(n*(n+1)/2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is the g.f. of the Catalan numbers (A000108).

Table of values

n a(n)
0 2
1 -2
2 -5
3 6
4 -7
5 14
6 -6
7 -9
8 27
9 -30
10 10
11 -11
12 44
13 -77
14 55
15 -10
16 -13
17 65
18 -156
19 182
20 -91
21 14
22 -15
23 90
24 -275
25 450
26 -378
27 140
28 -14
29 -17
30 119
31 -442
32 935
33 -1122
34 714
35 -204
36 18
37 -19
38 152
39 -665
40 1729
41 -2717
42 2508
43 -1254
44 285
45 -18
46 -21
47 189
48 -952
49 2940
50 -5733
51 7007
52 -5148
53 2079
54 -385
55 22
56 -23
57 230
58 -1311
59 4692
60 -10948
61 16744
62 -16445
63 9867
64 -3289
65 506

List of values

[2, -2, -5, 6, -7, 14, -6, -9, 27, -30, 10, -11, 44, -77, 55, -10, -13, 65, -156, 182, -91, 14, -15, 90, -275, 450, -378, 140, -14, -17, 119, -442, 935, -1122, 714, -204, 18, -19, 152, -665, 1729, -2717, 2508, -1254, 285, -18, -21, 189, -952, 2940, -5733, 7007, -5148, 2079, -385, 22, -23, 230, -1311, 4692, -10948, 16744, -16445, 9867, -3289, 506]