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A045821 as a simple table

n a(n)
0 -1
1 1
2 1
3 1
4 7
5 17
6 49
7 145
8 415
9 1201
10 3473
11 10033
12 28999
13 83809
14 242209
15 700001
16 2023039
17 5846689
18 16897249
19 48833953
20 141132743
21 407881201
22 1178798545
23 3406791025
24 9845808799
25 28454915537
26 82236232177
27 237667122001

[-1,1,1,1,7,17,49,145,415,1201,3473,10033,28999,
 83809,242209,700001,2023039,5846689,16897249,
 48833953,141132743,407881201,1178798545,
 3406791025,9845808799,28454915537,82236232177,
 237667122001]

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Last modified November 17 16:07 EST 2019. Contains 329240 sequences. (Running on oeis4.)