A273939 - cp's OEIS frontend

A273939 a(0) = 1, a(1) = 2; for k>0, a(2k) = ka(2k-1) + a(2k-2), a(2k+1) = a(2k) + a(2*k-1).

n	a(n)
0	1
1	2
2	3
3	5
4	13
5	18
6	67
7	85
8	407
9	492
10	2867
11	3359
12	23021
13	26380
14	207681
15	234061
16	2080169
17	2314230
18	22908239
19	25222469
20	275132929
21	300355398
22	3579042307
23	3879397705
24	50131814767
25	54011212472
26	752277576903
27	806288789375
28	12040320628153

[1, 2, 3, 5, 13, 18, 67, 85, 407, 492, 2867, 3359, 23021, 26380, 207681, 234061, 2080169, 2314230, 22908239, 25222469, 275132929, 300355398, 3579042307, 3879397705, 50131814767, 54011212472, 752277576903, 806288789375, 12040320628153]

cp's OEIS Frontend

A273939 a(0) = 1, a(1) = 2; for k>0, a(2k) = ka(2k-1) + a(2k-2), a(2k+1) = a(2k) + a(2*k-1).

Table of values

List of values

cp's OEIS Frontend

A273939 a(0) = 1, a(1) = 2; for k>0, a(2*k) = k*a(2*k-1) + a(2*k-2), a(2*k+1) = a(2*k) + a(2*k-1).

Table of values

List of values

A273939 a(0) = 1, a(1) = 2; for k>0, a(2k) = ka(2k-1) + a(2k-2), a(2k+1) = a(2k) + a(2*k-1).