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A268447 as a simple table

n a(n)
8 1
9 18
10 189
11 1518
12 10350
13 63180
14 356265
15 1893294
16 9612108
17 47071640
18 223926516
19 1040310648
20 4739192952
21 21238169904
22 93865125915
23 409972529754
24 1772528290407
25 7596549816030
26 32308782859535
27 136496564854650
28 573285572389530
29 2395339717603140
30 9962435643667605

[1,18,189,1518,10350,63180,356265,1893294,9612108,
 47071640,223926516,1040310648,4739192952,
 21238169904,93865125915,409972529754,
 1772528290407,7596549816030,32308782859535,
 136496564854650,573285572389530,2395339717603140,
 9962435643667605]

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Last modified November 17 03:50 EST 2019. Contains 329217 sequences. (Running on oeis4.)