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A280891 as a simple table

n a(n)
1 1
2 4
3 12
4 37
5 118
6 387
7 1298
8 4433
9 15366
10 53924
11 191216
12 684114
13 2466428
14 8951945
15 32683230
16 119949945
17 442281030
18 1637618400
19 6086481720
20 22699003830
21 84918443220
22 318593346630
23 1198421583684
24 4518886787802
25 17077448924828
26 64671604514552
27 245380598678208
28 932708665735364
29 3551238550341944
30 13542393822575541

[1,4,12,37,118,387,1298,4433,15366,53924,191216,
 684114,2466428,8951945,32683230,119949945,
 442281030,1637618400,6086481720,22699003830,
 84918443220,318593346630,1198421583684,
 4518886787802,17077448924828,64671604514552,
 245380598678208,932708665735364,3551238550341944,
 13542393822575541]

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Last modified July 11 22:52 EDT 2020. Contains 335652 sequences. (Running on oeis4.)