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A071976 as a simple table

na(n)
11
22
36
420
570
6252
7924
83432
912870
1048619
11184735
12705222
132702609
1410390940
1540062132
16154830696
17599641425
182326640877
199042327525
2035194002709
21137160956815
22535193552973
232090558951396
248174176541450
2531990402045260

[1,2,6,20,70,252,924,3432,12870,48619,184735,
 705222,2702609,10390940,40062132,154830696,
 599641425,2326640877,9042327525,35194002709,
 137160956815,535193552973,2090558951396,
 8174176541450,31990402045260]