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A246764 as a simple table

na(n)
01
11
23
37
417
578
6247
7916
83301
911272
1041854
11150485
12538585
131954912
146978464
1525170446
1690851829
17326048198
181176355862
194230352602
2015222263126
2154855015353
22197302183497
23710556528403
242557837610375
259205575728179
2633148388282116
27119307072980025

[1,1,3,7,17,78,247,916,3301,11272,41854,150485,
 538585,1954912,6978464,25170446,90851829,
 326048198,1176355862,4230352602,15222263126,
 54855015353,197302183497,710556528403,
 2557837610375,9205575728179,33148388282116,
 119307072980025]