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A137732 as a simple table

na(n)
11
21
32
45
516
655
7224
8935
94400
1021262
11111624
12596805
133457354
1420147882
15125455512
16792576243
175277532388
1835519373064
19252120178596
201800810613940
2113492153025558
22102095379031327
23804122472505530
246395239610004277

[1,1,2,5,16,55,224,935,4400,21262,111624,596805,
 3457354,20147882,125455512,792576243,5277532388,
 35519373064,252120178596,1800810613940,
 13492153025558,102095379031327,804122472505530,
 6395239610004277]