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A137958 as a simple table

na(n)
01
11
24
318
4100
5587
63660
723640
8157076
91066281
107363620
1151568732
12365369868
132614235293
1418862816112
15137096744232
161002785827620
177376023180645
1854525165453672
19404858512190316
203018190533410664
2122581907465905018

[1,1,4,18,100,587,3660,23640,157076,1066281,
 7363620,51568732,365369868,2614235293,18862816112,
 137096744232,1002785827620,7376023180645,
 54525165453672,404858512190316,3018190533410664,
 22581907465905018]