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A026618 as a simple table

n a(n)
1 1
2 11
3 50
4 212
5 870
6 3509
7 14014
8 55640
9 220116
10 868870
11 3425092
12 13491064
13 53117350
14 209097945
15 823111350
16 3240499440
17 12759776700
18 50254414650
19 197979380220
20 780170359800
21 3075303389340

[1,11,50,212,870,3509,14014,55640,220116,868870,
 3425092,13491064,53117350,209097945,823111350,
 3240499440,12759776700,50254414650,197979380220,
 780170359800,3075303389340]

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Last modified August 12 11:46 EDT 2022. Contains 356072 sequences. (Running on oeis4.)