A130169 - cp's OEIS frontend

A130169 a(1) = 1; for n>1, a(n) = (c(n) + c(n+1))/2, where c(n) = A130168(n).

n	a(n)
1	1
2	2
3	9
4	63
5	621
6	8127
7	135729
8	2810403
9	70558101
10	2109957687
11	74061977049
12	3014272078443
13	140764140297981
14	7474792551154047
15	447790997859123969
16	30053688313164013683
17	2245843775591721612261
18	185829940905166760571207
19	16941047558158020804504489

[1, 2, 9, 63, 621, 8127, 135729, 2810403, 70558101, 2109957687, 74061977049, 3014272078443, 140764140297981, 7474792551154047, 447790997859123969, 30053688313164013683, 2245843775591721612261, 185829940905166760571207, 16941047558158020804504489]

cp's OEIS Frontend

A130169 a(1) = 1; for n>1, a(n) = (c(n) + c(n+1))/2, where c(n) = A130168(n).

Table of values

List of values