A074864 - cp's OEIS frontend

A074864 a(n) = a(n-1) + a(n-2) + R(a(n-3)) + R(a(n-4)) where a(1)=a(2)=a(3)=a(4)=1 and R(n) (A004086) is the reverse of n.

n	a(n)
1	1
2	1
3	1
4	1
5	4
6	7
7	13
8	25
9	49
10	112
11	244
12	502
13	1051
14	2206
15	3904
16	7816
17	19243
18	37174
19	66697
20	144349
21	292510
22	563698
23	1879315
24	3401746
25	6192718
26	15630610
27	33434152
28	63708721
29	106919440
30	197375245
31	342218854
32	597294436
33	1527006682
34	3125687152

[1, 1, 1, 1, 4, 7, 13, 25, 49, 112, 244, 502, 1051, 2206, 3904, 7816, 19243, 37174, 66697, 144349, 292510, 563698, 1879315, 3401746, 6192718, 15630610, 33434152, 63708721, 106919440, 197375245, 342218854, 597294436, 1527006682, 3125687152]

cp's OEIS Frontend

A074864 a(n) = a(n-1) + a(n-2) + R(a(n-3)) + R(a(n-4)) where a(1)=a(2)=a(3)=a(4)=1 and R(n) (A004086) is the reverse of n.

Table of values

List of values