A077372 - OEIS

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A077372 as a simple table

n	a(n)
1	0
2	1
3	1
4	2
5	3
6	5
7	8
8	13
9	21
10	34
11	55
12	89
13	121393
14	1836311903
15	2504730781961
16	10610209857723
17	10284720757613717413913
18	184551825793033096366333
19	59425114757512643212875125
20	155576970220531065681649693

[0,1,1,2,3,5,8,13,21,34,55,89,121393,1836311903, 2504730781961,10610209857723, 10284720757613717413913,184551825793033096366333, 59425114757512643212875125, 155576970220531065681649693]