A189020 - OEIS

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A189020 as a simple table

n	a(n)
0	1
1	89
2	3575
3	93237
4	1951526
5	35270969
6	578262093
7	8840109380
8	128217432396
9	1784942188189
10	24045237260214
11	315312623543840
12	4042957241191810
13	50862246063060180
14	629513636928477232
15	7681900592647818929

[1,89,3575,93237,1951526,35270969,578262093, 8840109380,128217432396,1784942188189, 24045237260214,315312623543840,4042957241191810, 50862246063060180,629513636928477232, 7681900592647818929]