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A206690 as a simple table

na(n)
18
2376
32816
424492
5213788
61915580
717277556
8156946368
91429962032
1013057140562
11119353104128
121091748256156
139990044761998
1491434371494388
15836958605238016
167661779056726008
1770141114109343664
18642134221496445414

[8,376,2816,24492,213788,1915580,17277556,
 156946368,1429962032,13057140562,119353104128,
 1091748256156,9990044761998,91434371494388,
 836958605238016,7661779056726008,
 70141114109343664,642134221496445414]