A140176 - OEIS

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A140176 as a simple table

n	a(n)
1	1
2	3
3	8
4	17
5	36
6	71
7	144
8	289
9	594
10	1231
11	2602
12	5573
13	12128
14	26727
15	59668
16	134729
17	307618
18	709503
19	1652402
20	3883445
21	9206712

[1,3,8,17,36,71,144,289,594,1231,2602,5573,12128, 26727,59668,134729,307618,709503,1652402,3883445, 9206712]