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A019481 as a simple table

n a(n)
0 4
1 12
2 37
3 115
4 358
5 1115
6 3473
7 10818
8 33697
9 104963
10 326950
11 1018419
12 3172281
13 9881362
14 30779529
15 95875387
16 298642966
17 930245227
18 2897627873
19 9025842914
20 28114666161
21 87574585651
22 272786737286
23 849705465187
24 2646753961545
25 8244393875250

[4,12,37,115,358,1115,3473,10818,33697,104963,
 326950,1018419,3172281,9881362,30779529,95875387,
 298642966,930245227,2897627873,9025842914,
 28114666161,87574585651,272786737286,849705465187,
 2646753961545,8244393875250]

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Last modified May 28 14:47 EDT 2020. Contains 334684 sequences. (Running on oeis4.)