A161653 - OEIS

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A161653 as a simple table

n	a(n)
0	1
1	40
2	819
3	11439
4	122549
5	1073668
6	8009350
7	52303783
8	305103058
9	1614351753
10	7841707642
11	35308785736
12	148545224987
13	587774258402
14	2199717843602
15	7823584303472
16	26553558780617
17	86314483678430
18	269565581279715

[1,40,819,11439,122549,1073668,8009350,52303783, 305103058,1614351753,7841707642,35308785736, 148545224987,587774258402,2199717843602, 7823584303472,26553558780617,86314483678430, 269565581279715]