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A216901 as a simple table

na(n)
1186621
2532900
31857351
49046409
517439233
669012421
7146766357
8289744476
9347411351
10390219121
111200809057
121393838392
133088676989
142383346701
153333147809
166041072349
176819663132
187822398453
199534770061
2012359264257
2118701296795
2220196246357
2325763014657

[186621,532900,1857351,9046409,17439233,69012421,
 146766357,289744476,347411351,390219121,
 1200809057,1393838392,3088676989,2383346701,
 3333147809,6041072349,6819663132,7822398453,
 9534770061,12359264257,18701296795,20196246357,
 25763014657]