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A074002 as a simple table

na(n)
10
20
36
46
530
672
7252
8756
92106
106642
1119602
1259292
13176904
14530712
151596510
164780782
1714351094
1843040160
19129146724
20387440172
211162202418

[0,0,6,6,30,72,252,756,2106,6642,19602,59292,
 176904,530712,1596510,4780782,14351094,43040160,
 129146724,387440172,1162202418]