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A254972 as a simple table

n a(n)
1 310
2 1282
3 6915
4 27211
5 116534
6 518534
7 2243657
8 9685030
9 42217091
10 183348161
11 795467850
12 3455917275
13 15010520704
14 65178568847
15 283071522309
16 1229382868909
17 5338953256844
18 23186438236007
19 100696512620379
20 437311942422531

[310,1282,6915,27211,116534,518534,2243657,
 9685030,42217091,183348161,795467850,3455917275,
 15010520704,65178568847,283071522309,
 1229382868909,5338953256844,23186438236007,
 100696512620379,437311942422531]

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Last modified January 27 15:45 EST 2022. Contains 350607 sequences. (Running on oeis4.)