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A218843 as a simple table

n a(n)
1 1
2 7
3 20
4 57
5 156
6 438
7 1220
8 3398
9 9468
10 26380
11 73496
12 204780
13 570556
14 1589672
15 4429140
16 12340436
17 34382820
18 95797176
19 266909376
20 743660900
21 2071982512
22 5772942284
23 16084528900
24 44814595084
25 124862092120
26 347889834096

[1,7,20,57,156,438,1220,3398,9468,26380,73496,
 204780,570556,1589672,4429140,12340436,34382820,
 95797176,266909376,743660900,2071982512,
 5772942284,16084528900,44814595084,124862092120,
 347889834096]

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Last modified April 5 20:21 EDT 2020. Contains 333260 sequences. (Running on oeis4.)