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A251687 as a simple table

na(n)
01
11
21
35
48
58
616
728
848
980
10128
11208
12320
13512
14768
151216
161792
172816
184096
196400
209216
2114336
2220480
2331744
2445056
2569632
2698304
27151552
28212992
29327680
30458752
31704512
32983040
331507328
342097152
353211264
364456448
376815744
389437184
3914417920
4019922944
4130408704
4241943040

[1,1,1,5,8,8,16,28,48,80,128,208,320,512,768,1216,
 1792,2816,4096,6400,9216,14336,20480,31744,45056,
 69632,98304,151552,212992,327680,458752,704512,
 983040,1507328,2097152,3211264,4456448,6815744,
 9437184,14417920,19922944,30408704,41943040]