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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.

A349959 a(n) = Sum_{k=0..floor(n/2)} (k-1)^2*A106828(n, k).

Table of values

n a(n)
0 1
1 0
2 0
3 0
4 3
5 20
6 190
7 1764
8 17773
9 192632
10 2250036
11 28254600
12 380304639
13 5468906508
14 83750505826
15 1361579283596
16 23431400945145
17 425669127018416
18 8142731710207432
19 163636478165355408
20 3447201944202849819
21 75973975479088955460
22 1748531872985454054246
23 41951755708613404583732

List of values

[1, 0, 0, 0, 3, 20, 190, 1764, 17773, 192632, 2250036, 28254600, 380304639, 5468906508, 83750505826, 1361579283596, 23431400945145, 425669127018416, 8142731710207432, 163636478165355408, 3447201944202849819, 75973975479088955460, 1748531872985454054246, 41951755708613404583732]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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