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A230950 as a simple table

na(n)
00
11
23
36
415
550
6186
7834
84243
924318
10154780
111083952
128280624
1368531308
14610796150
155832677415
1659411150931
17642979374958
187368000716808
1989121684577460
201134732527849730
2115170256449030866
22212469074496520610
233111026318662704255
2447532980801984327584

[0,1,3,6,15,50,186,834,4243,24318,154780,1083952,
 8280624,68531308,610796150,5832677415,59411150931,
 642979374958,7368000716808,89121684577460,
 1134732527849730,15170256449030866,
 212469074496520610,3111026318662704255,
 47532980801984327584]