A238825 - cp's OEIS frontend

A238825 a(1)..a(4) = 0,0,0,1; thereafter a(n) = a(n-2)+a(n-3)+2*(d(n-3)+d(n-4)) where d(n) = A238824(n).

n	a(n)
1	0
2	0
3	0
4	1
5	2
6	5
7	11
8	27
9	64
10	158
11	387
12	956
13	2355
14	5809
15	14313
16	35272
17	86894
18	214075
19	527368
20	1299185
21	3200551
22	7884653
23	19424072
24	47851896
25	117884841
26	290413626
27	715444487
28	1762523473
29	4342040215
30	10696772780
31	26351885188
32	64918818701

[0, 0, 0, 1, 2, 5, 11, 27, 64, 158, 387, 956, 2355, 5809, 14313, 35272, 86894, 214075, 527368, 1299185, 3200551, 7884653, 19424072, 47851896, 117884841, 290413626, 715444487, 1762523473, 4342040215, 10696772780, 26351885188, 64918818701]

cp's OEIS Frontend

A238825 a(1)..a(4) = 0,0,0,1; thereafter a(n) = a(n-2)+a(n-3)+2*(d(n-3)+d(n-4)) where d(n) = A238824(n).

Table of values

List of values