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.

A059116 The sequence lambda(4,n), where lambda is defined in A055203. Number of ways of placing n identifiable positive intervals with a total of exactly four starting and/or finishing points.

Table of values

n a(n)
0 0
1 0
2 6
3 114
4 978
5 6810
6 43746
7 271194
8 1653378
9 9998970
10 60229986
11 362088474
12 2174656578
13 13054316730
14 78345032226
15 470127588954
16 2820937720578
17 16926142884090
18 101558406986466
19 609355090964634
20 3656144492925378

List of values

[0, 0, 6, 114, 978, 6810, 43746, 271194, 1653378, 9998970, 60229986, 362088474, 2174656578, 13054316730, 78345032226, 470127588954, 2820937720578, 16926142884090, 101558406986466, 609355090964634, 3656144492925378]