A300863 - cp's OEIS frontend

A300863 Signed recurrence over enriched p-trees: a(n) = (-1)^(n - 1) + Sum_{y1 + ... + yk = n, y1 >= ... >= yk > 0, k > 1} a(y1) * ... * a(yk).

n	a(n)
1	1
2	0
3	2
4	2
5	6
6	14
7	34
8	82
9	214
10	566
11	1482
12	4058
13	10950
14	30406
15	83786
16	235714
17	658286
18	1874254
19	5293674
20	15189810
21	43312542
22	125075238
23	359185586
24	1043712922
25	3015569582
26	8800146182
27	25565402802
28	74918274562
29	218572345718
30	642783954238
31	1882606578002

[1, 0, 2, 2, 6, 14, 34, 82, 214, 566, 1482, 4058, 10950, 30406, 83786, 235714, 658286, 1874254, 5293674, 15189810, 43312542, 125075238, 359185586, 1043712922, 3015569582, 8800146182, 25565402802, 74918274562, 218572345718, 642783954238, 1882606578002]

cp's OEIS Frontend

A300863 Signed recurrence over enriched p-trees: a(n) = (-1)^(n - 1) + Sum_{y1 + ... + yk = n, y1 >= ... >= yk > 0, k > 1} a(y1) * ... * a(yk).

Table of values

List of values