A021064 - OEIS

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A021064 as a simple table

n	a(n)
0	1
1	18
2	241
3	2982
4	36085
5	433986
6	5210857
7	62539614
8	750503869
9	9006132954
10	108073857073
11	1296887073846
12	15562647261253
13	186751774276722
14	2241021312778489
15	26892255817780878
16	322707070006818637

[1,18,241,2982,36085,433986,5210857,62539614, 750503869,9006132954,108073857073,1296887073846, 15562647261253,186751774276722,2241021312778489, 26892255817780878,322707070006818637]