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A218481 as a simple table

na(n)
01
12
25
313
434
588
6225
7569
81425
93538
108717
1121331
1251879
13125474
14301929
15723144
161724532
174096210
189693455
1922859524
2053733252
21125919189
22294232580
23685661202
241593719407
253695348909
268548564856
2719732115915
2845450793102
29104481137953
30239718272765

[1,2,5,13,34,88,225,569,1425,3538,8717,21331,
 51879,125474,301929,723144,1724532,4096210,
 9693455,22859524,53733252,125919189,294232580,
 685661202,1593719407,3695348909,8548564856,
 19732115915,45450793102,104481137953,239718272765]