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A266733 as a simple table

n a(n)
0 0
1 21
2 168
3 756
4 2520
5 6930
6 16632
7 36036
8 72072
9 135135
10 240240
11 408408
12 668304
13 1058148
14 1627920
15 2441880
16 3581424
17 5148297
18 7268184
19 10094700
20 13813800
21 18648630
22 24864840
23 32776380
24 42751800
25 55221075
26 70682976
27 89713008
28 112971936
29 141214920
30 175301280

[0,21,168,756,2520,6930,16632,36036,72072,135135,
 240240,408408,668304,1058148,1627920,2441880,
 3581424,5148297,7268184,10094700,13813800,
 18648630,24864840,32776380,42751800,55221075,
 70682976,89713008,112971936,141214920,175301280]

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Last modified September 18 05:30 EDT 2024. Contains 375995 sequences. (Running on oeis4.)