A240820 - cp's OEIS frontend

A240820 a(n) = length (or lifetime) of the meta-Fibonacci sequence f(k) = k for k <= n; f(k) = f(k-f(k-3)) + f(k-f(k-n)) if that sequence is only defined for finitely many terms, or 0 if that sequence is infinite.

n	a(n)
3	20
4	71
5	34
6	0
7	46
8	34
9	36
10	39
11	90
12	0
13	142
14	70
15	91
16	94
17	255
18	2004
19	306
20	525
21	259
22	454
23	304
24	1866
25	316
26	198
27	254
28	297
29	415
30	3315
31	348
32	406
33	397
34	420
35	903
36	1226
37	408
38	589
39	1294
40	535
41	490
42	958
43	1343
44	477
45	492
46	915
47	1378
48	1723
49	797
50	1869
51	745
52	696
53	863
54	1070
55	560

[20, 71, 34, 0, 46, 34, 36, 39, 90, 0, 142, 70, 91, 94, 255, 2004, 306, 525, 259, 454, 304, 1866, 316, 198, 254, 297, 415, 3315, 348, 406, 397, 420, 903, 1226, 408, 589, 1294, 535, 490, 958, 1343, 477, 492, 915, 1378, 1723, 797, 1869, 745, 696, 863, 1070, 560]

cp's OEIS Frontend

A240820 a(n) = length (or lifetime) of the meta-Fibonacci sequence f(k) = k for k <= n; f(k) = f(k-f(k-3)) + f(k-f(k-n)) if that sequence is only defined for finitely many terms, or 0 if that sequence is infinite.

Table of values

List of values