A056921 - cp's OEIS frontend

A056921 a(0) = 0, a(1) = 1, a(2n) = na(2n-1) + a(2n-2), a(2n+1) = a(2n) + a(2*n-1).

n	a(n)
0	0
1	1
2	1
3	2
4	5
5	7
6	26
7	33
8	158
9	191
10	1113
11	1304
12	8937
13	10241
14	80624
15	90865
16	807544
17	898409
18	8893225
19	9791634
20	106809565
21	116601199
22	1389422754
23	1506023953
24	19461710190
25	20967734143
26	292042254049
27	313009988192
28	4674182088737

[0, 1, 1, 2, 5, 7, 26, 33, 158, 191, 1113, 1304, 8937, 10241, 80624, 90865, 807544, 898409, 8893225, 9791634, 106809565, 116601199, 1389422754, 1506023953, 19461710190, 20967734143, 292042254049, 313009988192, 4674182088737]

cp's OEIS Frontend

A056921 a(0) = 0, a(1) = 1, a(2n) = na(2n-1) + a(2n-2), a(2n+1) = a(2n) + a(2*n-1).

Table of values

List of values

cp's OEIS Frontend

A056921 a(0) = 0, a(1) = 1, a(2*n) = n*a(2*n-1) + a(2*n-2), a(2*n+1) = a(2*n) + a(2*n-1).

Table of values

List of values

A056921 a(0) = 0, a(1) = 1, a(2n) = na(2n-1) + a(2n-2), a(2n+1) = a(2n) + a(2*n-1).