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A277782 as a simple table

n a(n)
1 0
2 3
3 12
4 84
5 498
6 3090
7 18930
8 116382
9 714810
10 4391526
11 26977818
12 165732438
13 1018135578
14 6254670486
15 38424042426
16 236048762550
17 1450108129242
18 8908386492054
19 54726504918906
20 336198967755510
21 2065356559176474

[0,3,12,84,498,3090,18930,116382,714810,4391526,
 26977818,165732438,1018135578,6254670486,
 38424042426,236048762550,1450108129242,
 8908386492054,54726504918906,336198967755510,
 2065356559176474]

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Last modified December 10 00:12 EST 2023. Contains 367696 sequences. (Running on oeis4.)