A271808 - OEIS

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A271808 as a simple table

n	a(n)
0	1
1	5
2	28
3	156
4	641
5	2913
6	11324
7	45880
8	184632
9	740372
10	2966293
11	11875196
12	47500072
13	190022977
14	760280365
15	3041361309

[1,5,28,156,641,2913,11324,45880,184632,740372, 2966293,11875196,47500072,190022977,760280365, 3041361309]