A114475 - OEIS

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A114475 as a simple table

n	a(n)
0	1
1	4
2	31
3	302
4	3011
5	30103
6	301030
7	3010300
8	30103000
9	301029996
10	3010299957
11	30102999567
12	301029995664
13	3010299956640
14	30102999566399
15	301029995663982
16	3010299956639812
17	30102999566398120

[1,4,31,302,3011,30103,301030,3010300,30103000, 301029996,3010299957,30102999567,301029995664, 3010299956640,30102999566399,301029995663982, 3010299956639812,30102999566398120]