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.

A278073 Triangle read by rows, coefficients of the polynomials P(m, n) = Sum_{k=1..n} binomial(m*n, m*k)* P(m, n-k)*z with P(m, 0) = 1 and m = 3.

Table of values

n a(n)
0 1
1 0
2 1
3 0
4 1
5 20
6 0
7 1
8 168
9 1680
10 0
11 1
12 1364
13 55440
14 369600
15 0
16 1
17 10920
18 1561560
19 33633600
20 168168000
21 0
22 1
23 87380
24 42771456
25 2385102720
26 34306272000
27 137225088000
28 0
29 1
30 699048
31 1160164320
32 158411809920
33 5105916816000
34 54752810112000
35 182509367040000

List of values

[1, 0, 1, 0, 1, 20, 0, 1, 168, 1680, 0, 1, 1364, 55440, 369600, 0, 1, 10920, 1561560, 33633600, 168168000, 0, 1, 87380, 42771456, 2385102720, 34306272000, 137225088000, 0, 1, 699048, 1160164320, 158411809920, 5105916816000, 54752810112000, 182509367040000]