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A138550 as a simple table

na(n)
01
10
21
31
45
516
675
7366
82016
911936
1075678
11507575
123575693
1326289408
14200709665
151584482382
1612888498820
17107698656192
18922140333952
198072379904752
2072108967554160
21656190909218560
226074106708205200
2357118680813847840

[1,0,1,1,5,16,75,366,2016,11936,75678,507575,
 3575693,26289408,200709665,1584482382,12888498820,
 107698656192,922140333952,8072379904752,
 72108967554160,656190909218560,6074106708205200,
 57118680813847840]