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A306940 as a simple table

na(n)
01
16
221
356
4126
5252
6461
7780
81209
91638
101638
110
12-6187
13-23238
14-63783
15-151316
16-326382
17-652764
18-1217483
19-2107560
20-3322995
21-4538430
22-4538430
230
2416942381
2563239286
26172791861
27408855776
28880983606
291761967212
303287837741
315694626340

[1,6,21,56,126,252,461,780,1209,1638,1638,0,-6187,
 -23238,-63783,-151316,-326382,-652764,-1217483,
 -2107560,-3322995,-4538430,-4538430,0,16942381,
 63239286,172791861,408855776,880983606,1761967212,
 3287837741,5694626340]