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A124004 as a simple table

na(n)
01
14
212
356
4244
51396
68200
755092
8390216
93005288
1024571056
11212258216
121939879668
1318429618408
14184041761768
151891831332208
1620301171282452
17222742563853912
182534535926617852
1929335558770589276
20349980362625040712
214228388321175157140

[1,4,12,56,244,1396,8200,55092,390216,3005288,
 24571056,212258216,1939879668,18429618408,
 184041761768,1891831332208,20301171282452,
 222742563853912,2534535926617852,
 29335558770589276,349980362625040712,
 4228388321175157140]