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A244455 as a simple table

na(n)
21
31
43
57
617
742
8105
9267
10684
111775
124639
1312238
1432491
1586859
16233496
17631082
181713613
194673455
2012795426
2135159212
2296927479
23268021520
24743188706
252066071045
265757360011
2716079027344
2844997313684
29126166307275
30354384737204
31997083779801
322809751278062

[1,1,3,7,17,42,105,267,684,1775,4639,12238,32491,
 86859,233496,631082,1713613,4673455,12795426,
 35159212,96927479,268021520,743188706,2066071045,
 5757360011,16079027344,44997313684,126166307275,
 354384737204,997083779801,2809751278062]