A042448 - OEIS

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A042448 as a simple table

n	a(n)
0	27
1	55
2	137
3	192
4	521
5	713
6	1947
7	4607
8	250725
9	506057
10	1262839
11	1768896
12	4800631
13	6569527
14	17939685
15	42448897
16	2310180123
17	4662809143
18	11635798409
19	16298607552
20	44233013513
21	60531621065
22	165296255643

[27,55,137,192,521,713,1947,4607,250725,506057, 1262839,1768896,4800631,6569527,17939685,42448897, 2310180123,4662809143,11635798409,16298607552, 44233013513,60531621065,165296255643]