A130802 - cp's OEIS frontend

A130802 a(1) = 1; a(n+1) = Sum_{k=1..n} (a(k)-th integer from among those positive integers which are coprime to (n+1-k)).

n	a(n)
1	1
2	1
3	2
4	4
5	9
6	20
7	47
8	110
9	260
10	614
11	1448
12	3421
13	8081
14	19092
15	45107
16	106567
17	251768
18	594816
19	1405285
20	3320066
21	7843851
22	18531547
23	43781846
24	103437135
25	244376187
26	577352823
27	1364029309
28	3222597827
29	7613573030
30	17987504932
31	42496516727
32	100400469160

[1, 1, 2, 4, 9, 20, 47, 110, 260, 614, 1448, 3421, 8081, 19092, 45107, 106567, 251768, 594816, 1405285, 3320066, 7843851, 18531547, 43781846, 103437135, 244376187, 577352823, 1364029309, 3222597827, 7613573030, 17987504932, 42496516727, 100400469160]

cp's OEIS Frontend

A130802 a(1) = 1; a(n+1) = Sum_{k=1..n} (a(k)-th integer from among those positive integers which are coprime to (n+1-k)).

Table of values

List of values