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A009542 as a simple table

na(n)
00
11
22
32
44
516
638
7104
8456
91600
106154
1129952
12131660
13644736
143516334
1518383616
16106736272
17645554176
183902982930
1925645936640
20170222268308
211160636121088
228352824699446
2360217271582720
24450765801976408

[0,1,2,2,4,16,38,104,456,1600,6154,29952,131660,
 644736,3516334,18383616,106736272,645554176,
 3902982930,25645936640,170222268308,1160636121088,
 8352824699446,60217271582720,450765801976408]