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A109877 as a simple table

n a(n)
1 1
2 5
3 23
4 108
5 574
6 3553
7 25451
8 207744
9 1904010
10 19357873
11 216180227
12 2630384900
13 34634700918
14 490653944569
15 7441157228467
16 120286142846816
17 2064606497134554
18 37499986847250777
19 718589662860007003
20 14487877657131343316

[1,5,23,108,574,3553,25451,207744,1904010,
 19357873,216180227,2630384900,34634700918,
 490653944569,7441157228467,120286142846816,
 2064606497134554,37499986847250777,
 718589662860007003,14487877657131343316]

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Last modified December 3 05:05 EST 2021. Contains 349445 sequences. (Running on oeis4.)