A059507 - OEIS

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A059507 as a simple table

n	a(n)
1	4
2	9
3	24
4	66
5	182
6	501
7	1376
8	3771
9	10314
10	28158
11	76744
12	208839
13	567484
14	1539981
15	4173852
16	11299386
17	30556346
18	82547961
19	222790424
20	600753663
21	1618558734
22	4357256694
23	11721125644
24	31507528971
25	84637773172

[4,9,24,66,182,501,1376,3771,10314,28158,76744, 208839,567484,1539981,4173852,11299386,30556346, 82547961,222790424,600753663,1618558734, 4357256694,11721125644,31507528971,84637773172]

[4,9,24,66,182,501,1376,3771,10314,28158,76744,
 208839,567484,1539981,4173852,11299386,30556346,
 82547961,222790424,600753663,1618558734,
 4357256694,11721125644,31507528971,84637773172]