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A004306 as a simple table

na(n)
01
11
22
36
424
544
680
7144
8264
9484
10888
111632
123000
135516
1410144
1518656
1634312
1763108
18116072
19213488
20392664
21722220
221328368
232443248
244493832
258265444
2615202520
2727961792
2851429752
2994594060
30173985600
31320009408
32588589064
331082584068
341991182536

[1,1,2,6,24,44,80,144,264,484,888,1632,3000,5516,
 10144,18656,34312,63108,116072,213488,392664,
 722220,1328368,2443248,4493832,8265444,15202520,
 27961792,51429752,94594060,173985600,320009408,
 588589064,1082584068,1991182536]