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A206984 as a simple table

na(n)
116
2256
3420
41866
57500
627762
7106110
8413526
91583234
106065840
1123380612
1289904320
13345225042
141327292244
155103379268
1619613888918
1775392090306
18289821707064
191114041030214
204282214237068
2116460713051026
2263274053473750

[16,256,420,1866,7500,27762,106110,413526,1583234,
 6065840,23380612,89904320,345225042,1327292244,
 5103379268,19613888918,75392090306,289821707064,
 1114041030214,4282214237068,16460713051026,
 63274053473750]