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A278384 as a simple table

na(n)
18
25936
3652343
450473056
53325788157
6198563803019
711105331450864
8586395701904408
929015321337746085
101335864857344408243
1157236190892283185233
122296849324984530935992
1387126825773953105905476

[8,5936,652343,50473056,3325788157,198563803019,
 11105331450864,586395701904408,29015321337746085,
 1335864857344408243,57236190892283185233,
 2296849324984530935992,87126825773953105905476]