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A279738 as a simple table

na(n)
15
226
3286
42948
529140
6281350
72672708
825057618
9232453138
102137856646
1119520180011
12177142880376
131599086960917
1414369091541568
15128599776050102
161146851081407532
1710195271184154052
1890377052821887506
19799110404458844621

[5,26,286,2948,29140,281350,2672708,25057618,
 232453138,2137856646,19520180011,177142880376,
 1599086960917,14369091541568,128599776050102,
 1146851081407532,10195271184154052,
 90377052821887506,799110404458844621]