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A004251 as a simple table

na(n)
01
11
22
34
411
531
6102
7342
81213
94361
1016016
1159348
12222117
13836315
143166852
1512042620
1645967479
17176005709
18675759564
192600672458
2010029832754
2138753710486
22149990133774
23581393603996
242256710139346
258770547818956
2634125389919850
27132919443189544
28518232001761434
292022337118015338
307898574056034636
3130873421455729728

[1,1,2,4,11,31,102,342,1213,4361,16016,59348,
 222117,836315,3166852,12042620,45967479,176005709,
 675759564,2600672458,10029832754,38753710486,
 149990133774,581393603996,2256710139346,
 8770547818956,34125389919850,132919443189544,
 518232001761434,2022337118015338,7898574056034636,
 30873421455729728]