A244900 - OEIS

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A244900 as a simple table

n	a(n)
1	4
2	22
3	118
4	646
5	3602
6	20358
7	116272
8	669516
9	3880216
10	22605350
11	132252980
12	776446672
13	4571648804
14	26982643512
15	156306697586
16	918491822736
17	5419056033902
18	32057939582902
19	190020627554666
20	1111060374626770

[4,22,118,646,3602,20358,116272,669516,3880216, 22605350,132252980,776446672,4571648804, 26982643512,156306697586,918491822736, 5419056033902,32057939582902,190020627554666, 1111060374626770]