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A287909 as a simple table

na(n)
01
12
22
34
420
556
68
716
8208
9992
1032
11192
12320
131920
142176
1561696
167424
1724064
1857856
19150528
20455680
211554432
226899712
233387392
2410473472
2529417472
2696542720
27113164288
28327368704
29344686592
301524400128
313142123520
322539454464
335335023616
3423823777792

[1,2,2,4,20,56,8,16,208,992,32,192,320,1920,2176,
 61696,7424,24064,57856,150528,455680,1554432,
 6899712,3387392,10473472,29417472,96542720,
 113164288,327368704,344686592,1524400128,
 3142123520,2539454464,5335023616,23823777792]