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A026749 as a simple table

n a(n)
1 1
2 6
3 30
4 143
5 671
6 3132
7 14601
8 68101
9 318035
10 1487661
11 6971222
12 32727472
13 153926409
14 725264305
15 3423262180
16 16185240446
17 76648901377
18 363557014067
19 1726994886004
20 8215502584008
21 39135887682617
22 186676023857041
23 891557875400175

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

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Last modified June 5 01:34 EDT 2024. Contains 373102 sequences. (Running on oeis4.)