A024472 - OEIS

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A024472 as a simple table

n	a(n)
1	1
2	2
3	9
4	14
5	35
6	57
7	127
8	205
9	420
10	680
11	1334
12	2158
13	4101
14	6636
15	12335
16	19958
17	36473
18	59015
19	106435
20	172215
21	307306
22	497232
23	879564
24	1423164
25	2499145
26	4043702
27	7057077

[1,2,9,14,35,57,127,205,420,680,1334,2158,4101, 6636,12335,19958,36473,59015,106435,172215,307306, 497232,879564,1423164,2499145,4043702,7057077]