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A018903 as a simple table

na(n)
01
15
226
3136
4712
53728
619520
7102208
8535168
92802176
1014672384
1176825600
12402264064
132106281984
1411028635648
1557746685952
16302365573120
171583206694912
188289777876992
1943405840482304
20227275931385856
211190032226385920
226231089632772096
2332626408891088896

[1,5,26,136,712,3728,19520,102208,535168,2802176,
 14672384,76825600,402264064,2106281984,
 11028635648,57746685952,302365573120,
 1583206694912,8289777876992,43405840482304,
 227275931385856,1190032226385920,6231089632772096,
 32626408891088896]