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A150227 as a simple table

na(n)
01
12
26
321
487
5320
61378
75734
824390
9104847
10468509
112014677
129086639
1340512331
14181514161
15817438205
163739814457
1716804267343
1877203662737
19352969349528
201615132230644
217418825839826
2234348050827280
23157446234193077
24730722286101755
253383822047970392
2615662986091827772
2772724675112435270

[1,2,6,21,87,320,1378,5734,24390,104847,468509,
 2014677,9086639,40512331,181514161,817438205,
 3739814457,16804267343,77203662737,352969349528,
 1615132230644,7418825839826,34348050827280,
 157446234193077,730722286101755,3383822047970392,
 15662986091827772,72724675112435270]