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A026749 as a simple table

na(n)
11
26
330
4143
5671
63132
714601
868101
9318035
101487661
116971222
1232727472
13153926409
14725264305
153423262180
1616185240446
1776648901377
18363557014067
191726994886004
208215502584008
2139135887682617
22186676023857041
23891557875400175

[1,6,30,143,671,3132,14601,68101,318035,1487661,
 6971222,32727472,153926409,725264305,3423262180,
 16185240446,76648901377,363557014067,
 1726994886004,8215502584008,39135887682617,
 186676023857041,891557875400175]