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A144706 as a simple table

na(n)
01
16
218
360
4210
5756
62772
710296
838610
9145860
10554268
112116296
128112468
1331201800
14120349800
15465352560
161803241170
177000818660
1827225405900
19106035791400
20413539586460
211614773623320

[1,6,18,60,210,756,2772,10296,38610,145860,554268,
 2116296,8112468,31201800,120349800,465352560,
 1803241170,7000818660,27225405900,106035791400,
 413539586460,1614773623320]