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A002750 as a simple table

na(n)
01
14
215
376
4373
52676
617539
7152860
81383561
914658148
10143131351
112070738924
1224754959805
13341745565396
145260157782923
1592358395065276
161377499388715409
1727622124789948100
18476285499100204831
1910464946811144407948
20222724531608924013701

[1,4,15,76,373,2676,17539,152860,1383561,14658148,
 143131351,2070738924,24754959805,341745565396,
 5260157782923,92358395065276,1377499388715409,
 27622124789948100,476285499100204831,
 10464946811144407948,222724531608924013701]