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A103972 as a simple table

n a(n)
0 1
1 6
2 12
3 60
4 264
5 1392
6 7392
7 41424
8 236640
9 1384512
10 8224896
11 49554816
12 301884672
13 1856878080
14 11514915840
15 71915838720
16 451938731520
17 2855705994240
18 18132621772800
19 115637702461440
20 740356410961920
21 4756888756101120
22 30662391191715840
23 198229520200704000
24 1285001080928845824

[1,6,12,60,264,1392,7392,41424,236640,1384512,
 8224896,49554816,301884672,1856878080,11514915840,
 71915838720,451938731520,2855705994240,
 18132621772800,115637702461440,740356410961920,
 4756888756101120,30662391191715840,
 198229520200704000,1285001080928845824]

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Last modified July 26 15:46 EDT 2024. Contains 374635 sequences. (Running on oeis4.)