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A283612 as a simple table

na(n)
01
11
24
313
457
5252
61322
77361
845057
9294392
102054394
1115172872
12118175823
13966300054
148268640847
1573825951226
16686049132714
176620780612228
1866224775509130
19685372810735380
207327272883303533

[1,1,4,13,57,252,1322,7361,45057,294392,2054394,
 15172872,118175823,966300054,8268640847,
 73825951226,686049132714,6620780612228,
 66224775509130,685372810735380,7327272883303533]