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A320931 as a simple table

na(n)
01
12
24
312
424
580
6292
7966
83876
915554
1061608
11254612
121065676
134471672
1419074968
1582043172
16354365492
171543432514
186760146292
1929732837780
20131440491584
21583419967664
222598585783488
2311615321544700
2452079369904384
25234157152231726
261055628140278948
274770576024205060

[1,2,4,12,24,80,292,966,3876,15554,61608,254612,
 1065676,4471672,19074968,82043172,354365492,
 1543432514,6760146292,29732837780,131440491584,
 583419967664,2598585783488,11615321544700,
 52079369904384,234157152231726,1055628140278948,
 4770576024205060]