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A061261 as a simple table

na(n)
01
12
26
315
437
585
6194
7423
8912
91917
103974
118096
1216302
1332382
1463668
15123851
16238756
17456190
18864821
191627016
203039845
215641884
2210406924
2319083836
2434802782
2563135539
26113965033
27204739662
28366156396
29652001918
301156200929
312042173379
323593341512

[1,2,6,15,37,85,194,423,912,1917,3974,8096,16302,
 32382,63668,123851,238756,456190,864821,1627016,
 3039845,5641884,10406924,19083836,34802782,
 63135539,113965033,204739662,366156396,652001918,
 1156200929,2042173379,3593341512]