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A305290 as a simple table

na(n)
10
2-7
331
4-86
5182
6-333
7549
8-844
91228
10-1715
112315
12-3042
133906
14-4921
156097
16-7448
178984
18-10719
1912663
20-14830
2117230
22-19877
2322781
24-25956
2529412
26-33163
2737219
28-41594
2946298
30-51345
3156745
32-62512
3368656
34-75191
3582127
36-89478
3797254
38-105469
39114133
40-123260
41132860

[0,-7,31,-86,182,-333,549,-844,1228,-1715,2315,
 -3042,3906,-4921,6097,-7448,8984,-10719,12663,
 -14830,17230,-19877,22781,-25956,29412,-33163,
 37219,-41594,46298,-51345,56745,-62512,68656,
 -75191,82127,-89478,97254,-105469,114133,-123260,
 132860]