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A180071 as a simple table

na(n)
00
11
22
36
412
524
698
7344
81236
95332
1023772
11110962
12547714
132840028
1415439466
1587299850
16512569668
173111575102
1819577613014
19127331688104
20852129210498
215853657714546
2241377621755100
23300511333393982
242233952140321104

[0,1,2,6,12,24,98,344,1236,5332,23772,110962,
 547714,2840028,15439466,87299850,512569668,
 3111575102,19577613014,127331688104,852129210498,
 5853657714546,41377621755100,300511333393982,
 2233952140321104]