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A268637 as a simple table

na(n)
1240
27128
3163878
43440052
568710116
61328460312
725093766490
8465757993812
98527096170390
10154406753980596
112770879234068744
1249351916066147196
13873425626212657504
1415373652306609086368
15269322517606253198046

[240,7128,163878,3440052,68710116,1328460312,
 25093766490,465757993812,8527096170390,
 154406753980596,2770879234068744,
 49351916066147196,873425626212657504,
 15373652306609086368,269322517606253198046]