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.

A356777 G.f.: Sum_{n=-oo..+oo} x^(n^2) * C(x)^(2*n-1), where C(x) = 1 + x*C(x)^2 is a g.f. of the Catalan numbers (A000108).

Table of values

n a(n)
0 1
1 1
2 -3
3 0
4 1
5 -5
6 5
7 0
8 0
9 1
10 -7
11 14
12 -7
13 0
14 0
15 0
16 1
17 -9
18 27
19 -30
20 9
21 0
22 0
23 0
24 0
25 1
26 -11
27 44
28 -77
29 55
30 -11
31 0
32 0
33 0
34 0
35 0
36 1
37 -13
38 65
39 -156
40 182
41 -91
42 13
43 0
44 0
45 0
46 0
47 0
48 0
49 1
50 -15
51 90
52 -275
53 450
54 -378
55 140
56 -15
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 1
65 -17
66 119
67 -442
68 935
69 -1122
70 714
71 -204
72 17
73 0
74 0
75 0
76 0
77 0
78 0
79 0
80 0
81 1
82 -19
83 152
84 -665
85 1729
86 -2717
87 2508
88 -1254
89 285
90 -19

List of values

[1, 1, -3, 0, 1, -5, 5, 0, 0, 1, -7, 14, -7, 0, 0, 0, 1, -9, 27, -30, 9, 0, 0, 0, 0, 1, -11, 44, -77, 55, -11, 0, 0, 0, 0, 0, 1, -13, 65, -156, 182, -91, 13, 0, 0, 0, 0, 0, 0, 1, -15, 90, -275, 450, -378, 140, -15, 0, 0, 0, 0, 0, 0, 0, 1, -17, 119, -442, 935, -1122, 714, -204, 17, 0, 0, 0, 0, 0, 0, 0, 0, 1, -19, 152, -665, 1729, -2717, 2508, -1254, 285, -19]