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A150125 as a simple table

na(n)
01
12
26
320
470
5250
6910
73362
812562
947316
10179340
11683300
122615034
1310045386
1438709710
15149568252
16579264594
172248081292
188740576452
1934038561714
20132748629244
21518386521518
222026694854474
237932078176602
2431074793596262
25121847340688340
26478166110438380
271877883164711372

[1,2,6,20,70,250,910,3362,12562,47316,179340,
 683300,2615034,10045386,38709710,149568252,
 579264594,2248081292,8740576452,34038561714,
 132748629244,518386521518,2026694854474,
 7932078176602,31074793596262,121847340688340,
 478166110438380,1877883164711372]