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A007122 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 2
7 4
8 15
9 36
10 108
11 276
12 770
13 2036
14 5586
15 15072
16 41370
17 113184
18 312488
19 863824
20 2401344
21 6692368
22 18724990
23 52531788
24 147824963
25 417006316
26 1179285900
27 3342274092
28 9492427854
29 27011049612
30 76999988534

[0,0,0,0,0,2,4,15,36,108,276,770,2036,5586,15072,
 41370,113184,312488,863824,2401344,6692368,
 18724990,52531788,147824963,417006316,1179285900,
 3342274092,9492427854,27011049612,76999988534]

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Last modified June 19 00:04 EDT 2021. Contains 345125 sequences. (Running on oeis4.)