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.

A144006 Triangle, read by rows of coefficients of x^n*y^k for k=0..n(n-1)/2 for n>=0, defined by e.g.f.: A(x,y) = 1 + Series_Reversion( Integral A(-x*y,y) dx ), with leading zeros in each row suppressed.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 -1
5 15
6 -10
7 3
8 -1
9 105
10 -105
11 55
12 -30
13 10
14 -3
15 1
16 945
17 -1260
18 910
19 -630
20 350
21 -168
22 76
23 -30
24 10
25 -3
26 1
27 10395
28 -17325
29 15750
30 -12880
31 9135
32 -5789
33 3381
34 -1806
35 910
36 -434
37 196
38 -76
39 30
40 -10
41 3
42 -1
43 135135
44 -270270
45 294525
46 -275275
47 228375

List of values

[1, 1, 1, 3, -1, 15, -10, 3, -1, 105, -105, 55, -30, 10, -3, 1, 945, -1260, 910, -630, 350, -168, 76, -30, 10, -3, 1, 10395, -17325, 15750, -12880, 9135, -5789, 3381, -1806, 910, -434, 196, -76, 30, -10, 3, -1, 135135, -270270, 294525, -275275, 228375]