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A057766 as a simple table

na(n)
11
22
36
420
560
6210
7756
82952
911565
1046550
11187803
12763200
133101683
1412627594
1551398640
16209268080
17851834453
183467196936
1914109860408
2057413439000
21233584274238
22950220869136
233865081177744
2415719992809672
2563930676119100

[1,2,6,20,60,210,756,2952,11565,46550,187803,
 763200,3101683,12627594,51398640,209268080,
 851834453,3467196936,14109860408,57413439000,
 233584274238,950220869136,3865081177744,
 15719992809672,63930676119100]