A183349 - OEIS

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A183349 as a simple table

n	a(n)
1	1
2	109
3	289
4	943
5	5121
6	21613
7	88177
8	387783
9	1670453
10	7119039
11	30633319
12	131658725
13	564682433
14	2424870987
15	10413508165
16	44703599613
17	191933847189
18	824103385305
19	3538210911515
20	15191170400903
21	65223636323455

[1,109,289,943,5121,21613,88177,387783,1670453, 7119039,30633319,131658725,564682433,2424870987, 10413508165,44703599613,191933847189,824103385305, 3538210911515,15191170400903,65223636323455]