A385830 - cp's OEIS frontend

A385830 a(0) = 1; a(n) = Sum_{k=0..n-1} (1 + k^2) * a(k) * a(n-1-k).

n	a(n)
0	1
1	1
2	3
3	20
4	241
5	4623
6	130300
7	5100750
8	265780029
9	17827454651
10	1498498011875
11	154408489507578
12	19151761451917580
13	2815820822235814540
14	484383420815495253624
15	96401320782466194458886
16	21981036279413999807199045
17	5693391431445001330242504699
18	1662538953499888924638316487305

[1, 1, 3, 20, 241, 4623, 130300, 5100750, 265780029, 17827454651, 1498498011875, 154408489507578, 19151761451917580, 2815820822235814540, 484383420815495253624, 96401320782466194458886, 21981036279413999807199045, 5693391431445001330242504699, 1662538953499888924638316487305]

cp's OEIS Frontend

A385830 a(0) = 1; a(n) = Sum_{k=0..n-1} (1 + k^2) * a(k) * a(n-1-k).

Table of values

List of values