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A151220 as a simple table

n a(n)
0 1
1 3
2 13
3 56
4 258
5 1208
6 5749
7 27646
8 133968
9 652592
10 3193440
11 15676731
12 77165036
13 380650135
14 1880986314
15 9308619584
16 46122972729
17 228769029625
18 1135698530874
19 5642322475774
20 28050311064755
21 139529410550457
22 694400800401623
23 3457363880665795
24 17220587369234781
25 85802417773381773

[1,3,13,56,258,1208,5749,27646,133968,652592,
 3193440,15676731,77165036,380650135,1880986314,
 9308619584,46122972729,228769029625,1135698530874,
 5642322475774,28050311064755,139529410550457,
 694400800401623,3457363880665795,
 17220587369234781,85802417773381773]

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Last modified October 30 12:22 EDT 2020. Contains 338079 sequences. (Running on oeis4.)