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A129869 as a simple table

na(n)
1-1
21
35
420
577
6294
71122
84290
916445
1063206
11243542
12940576
133640210
1414115100
1554826020
16213286590
17830905245
183241119750
1912657425550
2049483369320
21193641552390
22758454277620
232973183318300
2411664026864100
2545791597230002
26179892016853724

[-1,1,5,20,77,294,1122,4290,16445,63206,243542,
 940576,3640210,14115100,54826020,213286590,
 830905245,3241119750,12657425550,49483369320,
 193641552390,758454277620,2973183318300,
 11664026864100,45791597230002,179892016853724]