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A292029 as a simple table

na(n)
21
36
440
5200
61056
74928
823808
9107136
10494080
112173952
129744384
1342225664
14185679872
15795770880
163451518976
1714668955648
1862970789888
19265876668416
201132226150400
214755349831680
2220120910954496
2384141991264256
24354160151101440
251475667296256000
266184144161734656

[1,6,40,200,1056,4928,23808,107136,494080,2173952,
 9744384,42225664,185679872,795770880,3451518976,
 14668955648,62970789888,265876668416,
 1132226150400,4755349831680,20120910954496,
 84141991264256,354160151101440,1475667296256000,
 6184144161734656]