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A261983 as a simple table

na(n)
00
10
21
31
44
59
618
741
889
9185
10388
11810
121670
133435
147040
1514360
1629226
1759347
18120229
19243166
20491086
21990446
221995410
234016259
248076960
2516231746
2632599774
2765437945
28131293192
29263316897
30527912140
311058061751
322120039885
334246934012
348505864640

[0,0,1,1,4,9,18,41,89,185,388,810,1670,3435,7040,
 14360,29226,59347,120229,243166,491086,990446,
 1995410,4016259,8076960,16231746,32599774,
 65437945,131293192,263316897,527912140,1058061751,
 2120039885,4246934012,8505864640]