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.

A213343 1-quantum transitions in systems of N spin 1/2 particles, in columns by combination indices. Triangle read by rows, T(n, k) for n >= 1 and 0 <= k <= floor((n-1)/2).

Table of values

n a(n)
1 1
2 4
3 12
4 3
5 32
6 24
7 80
8 120
9 10
10 192
11 480
12 120
13 448
14 1680
15 840
16 35
17 1024
18 5376
19 4480
20 560
21 2304
22 16128
23 20160
24 5040
25 126
26 5120
27 46080
28 80640
29 33600
30 2520
31 11264
32 126720
33 295680
34 184800
35 27720
36 462
37 24576
38 337920
39 1013760
40 887040
41 221760
42 11088

List of values

[1, 4, 12, 3, 32, 24, 80, 120, 10, 192, 480, 120, 448, 1680, 840, 35, 1024, 5376, 4480, 560, 2304, 16128, 20160, 5040, 126, 5120, 46080, 80640, 33600, 2520, 11264, 126720, 295680, 184800, 27720, 462, 24576, 337920, 1013760, 887040, 221760, 11088]