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.

A355346 G.f.: A(x,y) = Sum_{n=-oo..+oo} (x*y)^(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 -4
2 2
3 -1
4 -4
5 0
6 -3
7 7
8 0
9 2
10 -8
11 5
12 0
13 -4
14 0
15 -23
16 14
17 0
18 23
19 0
20 0
21 -70
22 41
23 0
24 21
25 0
26 0
27 2
28 -222
29 127
30 0
31 90
32 0
33 0
34 -4
35 0
36 -726
37 409
38 0
39 297
40 0
41 0
42 47
43 0
44 0
45 -2431
46 1355
47 0
48 1001
49 0
50 0
51 45
52 0
53 0
54 0
55 -8294
56 4587
57 0
58 3431
59 0
60 0
61 284
62 0
63 0
64 0
65 2
66 -28730
67 15795
68 0
69 11927
70 0
71 0
72 1001
73 0
74 0
75 0
76 -4
77 0
78 -100776
79 55146
80 0
81 41955
82 0
83 0
84 3640
85 0
86 0
87 0
88 79
89 0
90 0
91 -357238
92 194752
93 0
94 149072
95 0
96 0
97 13260
98 0
99 0
100 0
101 77
102 0
103 0
104 0

List of values

[2, -4, 2, -1, -4, 0, -3, 7, 0, 2, -8, 5, 0, -4, 0, -23, 14, 0, 23, 0, 0, -70, 41, 0, 21, 0, 0, 2, -222, 127, 0, 90, 0, 0, -4, 0, -726, 409, 0, 297, 0, 0, 47, 0, 0, -2431, 1355, 0, 1001, 0, 0, 45, 0, 0, 0, -8294, 4587, 0, 3431, 0, 0, 284, 0, 0, 0, 2, -28730, 15795, 0, 11927, 0, 0, 1001, 0, 0, 0, -4, 0, -100776, 55146, 0, 41955, 0, 0, 3640, 0, 0, 0, 79, 0, 0, -357238, 194752, 0, 149072, 0, 0, 13260, 0, 0, 0, 77, 0, 0, 0]