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A371991 as a simple table

na(n)
21
30
41
51
62
73
86
96
1016
1121
1242
1363
14129
15201
16404
17685
181340
192385
204625
218487
2216409
2330735
2459282
25112530
26217182
27415605
28803076
291545463
302990945
315778267
3211201472
3321702645
3442140890
3581830744
36159139428
37309590883
38602935713
391174779207
402290915478
414469734225
428726815041
4317047041429
4433319598126

[1,0,1,1,2,3,6,6,16,21,42,63,129,201,404,685,1340,
 2385,4625,8487,16409,30735,59282,112530,217182,
 415605,803076,1545463,2990945,5778267,11201472,
 21702645,42140890,81830744,159139428,309590883,
 602935713,1174779207,2290915478,4469734225,
 8726815041,17047041429,33319598126]