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A203840 as a simple table

na(n)
11
24
316
450
5184
6810
73502
814751
963204
10274824
111195748
125201911
1322685592
1499123373
15433452835
161896510229
178302931200
1836367291798
19159341158550
20698313973844
213060976848490
2213419502926856
2358838771883237

[1,4,16,50,184,810,3502,14751,63204,274824,
 1195748,5201911,22685592,99123373,433452835,
 1896510229,8302931200,36367291798,159341158550,
 698313973844,3060976848490,13419502926856,
 58838771883237]