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A176720 as a simple table

na(n)
01
12
24
38
418
544
6112
7288
8744
91938
105104
1113584
1236456
1398468
14267376
15729488
161999074
175500412
1815189636
1942084952
20116949848
21325878288
22910333152
232548892864
247152113760
2520108587038
2656641227416
27159820928328

[1,2,4,8,18,44,112,288,744,1938,5104,13584,36456,
 98468,267376,729488,1999074,5500412,15189636,
 42084952,116949848,325878288,910333152,2548892864,
 7152113760,20108587038,56641227416,159820928328]