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A129772 as a simple table

na(n)
01
12
26
316
448
5140
6420
71248
83744
911200
1033600
11100704
12302112
13906056
142718168
158153664
1624460992
1773380480
18220141440
19660416832
201981250496
215943729088
2217831187264
2353493494592
24160480483776
25481441249920
261444323749760

[1,2,6,16,48,140,420,1248,3744,11200,33600,100704,
 302112,906056,2718168,8153664,24460992,73380480,
 220141440,660416832,1981250496,5943729088,
 17831187264,53493494592,160480483776,481441249920,
 1444323749760]