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A245191 as a simple table

na(n)
01
12
25
38
420
534
685
7128
8320
9544
101360
112056
125140
138738
1421845
1532768
1681920
17139264
18348160
19526336
201315840
212236928
225592320
238388736
2420971840
2535652128
2689130320
27134744072
28336860180
29572662306
301431655765
312147483648
325368709120
339126805504

[1,2,5,8,20,34,85,128,320,544,1360,2056,5140,8738,
 21845,32768,81920,139264,348160,526336,1315840,
 2236928,5592320,8388736,20971840,35652128,
 89130320,134744072,336860180,572662306,1431655765,
 2147483648,5368709120,9126805504]