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A277237 as a simple table

na(n)
01
16
215
339
499
5255
6651
71671
84275
910959
1028059
1171895
12184131
13471711
141208235
153095079
167928019
1720308335
1852020411
19133253751
20341335395
21874350399
222239691979
235737093575
2414695861491
2537644235791
2696427681755
27247004624919
28632715351939
291620733851615

[1,6,15,39,99,255,651,1671,4275,10959,28059,71895,
 184131,471711,1208235,3095079,7928019,20308335,
 52020411,133253751,341335395,874350399,2239691979,
 5737093575,14695861491,37644235791,96427681755,
 247004624919,632715351939,1620733851615]