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A228551 as a simple table

na(n)
01
11
22
312
4146
52820
679682
73109932
8163268786
911373086100
101049057429762
11128748967088412
1221220651011079346
134747770003765805380
141456585782002699624642
156390825031791150383749864

[1,1,2,12,146,2820,79682,3109932,163268786,
 11373086100,1049057429762,128748967088412,
 21220651011079346,4747770003765805380,
 1456585782002699624642,6390825031791150383749864]