A139453 - OEIS

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A139453 as a simple table

n	a(n)
1	4
2	5
3	6
4	7
5	9
6	12
7	73
8	129
9	142
10	144
11	253
12	455
13	531
14	734
15	1009
16	1193
17	1553
18	2449
19	3309
20	13534
21	17513
22	17832
23	22852

[4,5,6,7,9,12,73,129,142,144,253,455,531,734,1009, 1193,1553,2449,3309,13534,17513,17832,22852]