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A183415 as a simple table

na(n)
15
234
3249
41920
515232
6123323
71012996
88413325
970482133
10594587235
115044756083
1243007895169
13368151018388
143162466934006
1527248906449457
16235414313839524
172038652180610193
1817691623325368274
19153819626587560407

[5,34,249,1920,15232,123323,1012996,8413325,
 70482133,594587235,5044756083,43007895169,
 368151018388,3162466934006,27248906449457,
 235414313839524,2038652180610193,
 17691623325368274,153819626587560407]