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A180810 as a simple table

n a(n)
1 0
2 20
3 429
4 5920
5 63954
6 510927
7 3362288
8 17975676
9 83628636
10 335900991
11 1222011613
12 3989760008
13 12105111844
14 33802351881
15 89361617169
16 221117356432
17 524533042878
18 1178959072101
19 2564070846089
20 5330170938874
21 10795501502457

[0,20,429,5920,63954,510927,3362288,17975676,
 83628636,335900991,1222011613,3989760008,
 12105111844,33802351881,89361617169,221117356432,
 524533042878,1178959072101,2564070846089,
 5330170938874,10795501502457]

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Last modified April 19 02:28 EDT 2024. Contains 371782 sequences. (Running on oeis4.)