A041646 - OEIS

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A041646 as a simple table

n	a(n)
0	18
1	37
2	1350
3	2737
4	99882
5	202501
6	7389918
7	14982337
8	546754050
9	1108490437
10	40452409782
11	82013310001
12	2992931569818
13	6067876449637
14	221436483756750
15	448940843963137
16	16383306866429682
17	33215554576822501

[18,37,1350,2737,99882,202501,7389918,14982337, 546754050,1108490437,40452409782,82013310001, 2992931569818,6067876449637,221436483756750, 448940843963137,16383306866429682, 33215554576822501]