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A047097 as a simple table

na(n)
01
14
216
360
4228
5860
63267
712426
847471
9181812
10698512
112690086
1210384712
1340170182
14155681112
15604362074
162349783665
179148780570
1835665860725
19139202880860
20543887439194
212127148912456
228326877989146
2332623644335536

[1,4,16,60,228,860,3267,12426,47471,181812,698512,
 2690086,10384712,40170182,155681112,604362074,
 2349783665,9148780570,35665860725,139202880860,
 543887439194,2127148912456,8326877989146,
 32623644335536]