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A219431 as a simple table

na(n)
12
224
3386
46832
5128442
62505720
750153770
81022997344
921170657906
10443175051304
119363994959442
12199387678947184
134273249614310458
1492093491647488488
151994264443643492586
1643366549723376465600
17946516448918441722706
1820726326157010810068856

[2,24,386,6832,128442,2505720,50153770,1022997344,
 21170657906,443175051304,9363994959442,
 199387678947184,4273249614310458,
 92093491647488488,1994264443643492586,
 43366549723376465600,946516448918441722706,
 20726326157010810068856]