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A250881 as a simple table

na(n)
18736
230360
373122
4144248
5250964
6400496
7600070
8856912
91178248
101571304
112043306
122601480
133253052
144005248
154865294
165840416
176937840
188164792
199528498
2011036184
2112695076
2214512400
2316495382
2418651248
2520987224
2623510536
2726228410

[8736,30360,73122,144248,250964,400496,600070,
 856912,1178248,1571304,2043306,2601480,3253052,
 4005248,4865294,5840416,6937840,8164792,9528498,
 11036184,12695076,14512400,16495382,18651248,
 20987224,23510536,26228410]