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A001261 as a simple table

na(n)
10
20
30
40
50
61
76
863
9616
106678
1177868
12978978
1313216104
14190899423
152939850914
1648106651593
17833848627248
1815265844099324
19294412707629208
205966764207952724
21126793739418994416
222819296088257641741
2365470320271760790078

[0,0,0,0,0,1,6,63,616,6678,77868,978978,13216104,
 190899423,2939850914,48106651593,833848627248,
 15265844099324,294412707629208,5966764207952724,
 126793739418994416,2819296088257641741,
 65470320271760790078]