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A247840 as a simple table

n a(n)
1 0
2 36
3 252
4 1548
5 9324
6 55980
7 335916
8 2015532
9 12093228
10 72559404
11 435356460
12 2612138796
13 15672832812
14 94036996908
15 564221981484
16 3385331888940
17 20311991333676
18 121871948002092
19 731231688012588
20 4387390128075564
21 26324340768453420

[0,36,252,1548,9324,55980,335916,2015532,12093228,
 72559404,435356460,2612138796,15672832812,
 94036996908,564221981484,3385331888940,
 20311991333676,121871948002092,731231688012588,
 4387390128075564,26324340768453420]

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Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)