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A250358 as a simple table

na(n)
16
236
3216
41293
57712
645866
7272760
81621963
99644496
1057346376
11340979312
122027446948
1312055094608
1471678940042
15426199029864
162534155836542
1715067950109140
1889593195408640
19532716168060704
203167500770096043

[6,36,216,1293,7712,45866,272760,1621963,9644496,
 57346376,340979312,2027446948,12055094608,
 71678940042,426199029864,2534155836542,
 15067950109140,89593195408640,532716168060704,
 3167500770096043]