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A249051 as a simple table

na(n)
12
23
37
413
50
661
7421
8841
90
102521
110
1227721
130
140
15360361
16720721
170
1812252241
190
200
210
22232792561
230
245354228881
250
2626771144401
270
2880313433201
290
302329089562801
3172201776446801
320
330
340
350
36144403552893601
370
380
390
405342931457063201
410

[2,3,7,13,0,61,421,841,0,2521,0,27721,0,0,360361,
 720721,0,12252241,0,0,0,232792561,0,5354228881,0,
 26771144401,0,80313433201,0,2329089562801,
 72201776446801,0,0,0,0,144403552893601,0,0,0,
 5342931457063201,0]