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A048120 as a simple table

na(n)
10
20
32
46
524
684
7312
81140
94248
1015852
1159688
12225624
13857424
143270216
1512518472
1648062520
17185034360
18714038448
192761343064
2010698992304
2141525207448
22161418403008
23628356425856
242449152822168
259557303840184

[0,0,2,6,24,84,312,1140,4248,15852,59688,225624,
 857424,3270216,12518472,48062520,185034360,
 714038448,2761343064,10698992304,41525207448,
 161418403008,628356425856,2449152822168,
 9557303840184]