A261788 - OEIS

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A261788 as a simple table

n	a(n)
0	1
1	2
2	5
3	12
4	30
5	81
6	224
7	626
8	1747
9	4909
10	13811
11	38934
12	109889
13	310666
14	880125
15	2500221
16	7125406
17	20376598
18	58472481
19	168349612
20	486198698
21	1408140693
22	4088769215
23	11899761717
24	34703682407

[1,2,5,12,30,81,224,626,1747,4909,13811,38934, 109889,310666,880125,2500221,7125406,20376598, 58472481,168349612,486198698,1408140693, 4088769215,11899761717,34703682407]