A242261 - OEIS

A242261 as a simple table

n	a(n)
1	1
2	2
3	4
4	10
5	18
6	36
7	72
8	148
9	156
10	312
11	456
12	1068
13	2136
14	2436
15	6552
16	12036
17	17976
18	29400
19	46308
20	93228
21	119736
22	200928
23	509556
24	911412
25	1351812
26	2665080
27	3978348
28	7988688
29	17315172
30	18646416

[1,2,4,10,18,36,72,148,156,312,456,1068,2136,2436, 6552,12036,17976,29400,46308,93228,119736,200928, 509556,911412,1351812,2665080,3978348,7988688, 17315172,18646416]