A301809 - cp's OEIS frontend

A301809 Group the natural numbers such that the first group is (1) then (2),(3),(4,5),(6,7,8),... with the n-th group containing F(n) sequential terms where F(n) is the n-th Fibonacci number (A000045(n)). Sequence gives the sum of terms in the n-th group.

n	a(n)
1	1
2	2
3	3
4	9
5	21
6	55
7	140
8	364
9	945
10	2465
11	6435
12	16821
13	43992
14	115102
15	301223
16	788425
17	2063817
18	5402651
19	14143524
20	37026936
21	96935685
22	253777537
23	664392743
24	1739393929
25	4553778096
26	11921922650
27	31211961195
28	81713914569
29	213929707485
30	560075086495
31	1466295355580
32	3838810662436
33	10050136117497

[1, 2, 3, 9, 21, 55, 140, 364, 945, 2465, 6435, 16821, 43992, 115102, 301223, 788425, 2063817, 5402651, 14143524, 37026936, 96935685, 253777537, 664392743, 1739393929, 4553778096, 11921922650, 31211961195, 81713914569, 213929707485, 560075086495, 1466295355580, 3838810662436, 10050136117497]

cp's OEIS Frontend

A301809 Group the natural numbers such that the first group is (1) then (2),(3),(4,5),(6,7,8),... with the n-th group containing F(n) sequential terms where F(n) is the n-th Fibonacci number (A000045(n)). Sequence gives the sum of terms in the n-th group.

Table of values

List of values