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A300652 as a simple table

na(n)
01
12
24
312
440
5136
6496
71952
87488
930368
10123456
11512384
122129664
139068672
1438391552
15165642752
16713405952
173109135872
1813528865792
1959591322624
20261549260800
211159547047936
225131968999424
2322883893137408
24101851069587456
25456703499042816
262042949493276672

[1,2,4,12,40,136,496,1952,7488,30368,123456,
 512384,2129664,9068672,38391552,165642752,
 713405952,3109135872,13528865792,59591322624,
 261549260800,1159547047936,5131968999424,
 22883893137408,101851069587456,456703499042816,
 2042949493276672]