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A276451 as a simple table

na(n)
10
21
32
412
530
6408
71012
817920
945600
101059380
112730756
1278115884
13203235032
146917206576
1518113945256
16714851008512
171881039165696
1884449819514060
19223049005408900
2011225502116862880
2129736777118603962
221658138369930988088
234403069737450280832

[0,1,2,12,30,408,1012,17920,45600,1059380,2730756,
 78115884,203235032,6917206576,18113945256,
 714851008512,1881039165696,84449819514060,
 223049005408900,11225502116862880,
 29736777118603962,1658138369930988088,
 4403069737450280832]