A124500 - OEIS

A124500 as a simple table

n	a(n)
0	1
1	1
2	2
3	4
4	10
5	25
6	67
7	180
8	495
9	1375
10	3871
11	10993
12	31493
13	90843
14	263686
15	769466
16	2256135
17	6643082
18	19634705
19	58232350
20	173242381
21	516860717
22	1546035258
23	4635543843
24	13929569399
25	41943013047
26	126532961332
27	382396277940

[1,1,2,4,10,25,67,180,495,1375,3871,10993,31493, 90843,263686,769466,2256135,6643082,19634705, 58232350,173242381,516860717,1546035258, 4635543843,13929569399,41943013047,126532961332, 382396277940]

[1,1,2,4,10,25,67,180,495,1375,3871,10993,31493,
 90843,263686,769466,2256135,6643082,19634705,
 58232350,173242381,516860717,1546035258,
 4635543843,13929569399,41943013047,126532961332,
 382396277940]