A081069 - OEIS

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A081069 as a simple table

n	a(n)
0	4
1	9
2	49
3	324
4	2209
5	15129
6	103684
7	710649
8	4870849
9	33385284
10	228826129
11	1568397609
12	10749957124
13	73681302249
14	505019158609
15	3461452808004
16	23725150497409
17	162614600673849
18	1114577054219524
19	7639424778862809

[4,9,49,324,2209,15129,103684,710649,4870849, 33385284,228826129,1568397609,10749957124, 73681302249,505019158609,3461452808004, 23725150497409,162614600673849,1114577054219524, 7639424778862809]