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A098878 as a simple table

na(n)
0-2
1-1
225
3341
43373
529789
6250045
72048381
816581373
9133432829
101070599165
118577357821
1268669157373
13549554511869
144397241253885
1535181150961661
16281462092005373
172251748274470909
1818014192351838205

[-2,-1,25,341,3373,29789,250045,2048381,16581373,
 133432829,1070599165,8577357821,68669157373,
 549554511869,4397241253885,35181150961661,
 281462092005373,2251748274470909,
 18014192351838205]