A257621 - cp's OEIS frontend

A257621 Triangle read by rows: T(n, k) = t(n-k, k), where t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)t(n-1,m) + f(n)t(n,m-1), and f(n) = 4*n + 3.

n	a(n)
0	1
1	3
2	3
3	9
4	42
5	9
6	27
7	393
8	393
9	27
10	81
11	3156
12	8646
13	3156
14	81
15	243
16	23631
17	142446
18	142446
19	23631
20	243
21	729
22	171006
23	2015895
24	4273380
25	2015895
26	171006
27	729
28	2187
29	1216725
30	26107983
31	102402705
32	102402705
33	26107983
34	1216725
35	2187
36	6561
37	8584872
38	320039388
39	2136524184
40	3891302790
41	2136524184
42	320039388
43	8584872
44	6561

[1, 3, 3, 9, 42, 9, 27, 393, 393, 27, 81, 3156, 8646, 3156, 81, 243, 23631, 142446, 142446, 23631, 243, 729, 171006, 2015895, 4273380, 2015895, 171006, 729, 2187, 1216725, 26107983, 102402705, 102402705, 26107983, 1216725, 2187, 6561, 8584872, 320039388, 2136524184, 3891302790, 2136524184, 320039388, 8584872, 6561]

cp's OEIS Frontend

A257621 Triangle read by rows: T(n, k) = t(n-k, k), where t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)t(n-1,m) + f(n)t(n,m-1), and f(n) = 4*n + 3.

Table of values

List of values

cp's OEIS Frontend

A257621 Triangle read by rows: T(n, k) = t(n-k, k), where t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)*t(n-1,m) + f(n)*t(n,m-1), and f(n) = 4*n + 3.

Table of values

List of values

A257621 Triangle read by rows: T(n, k) = t(n-k, k), where t(0,0) = 1, t(n,m) = 0 if n < 0 or m < 0, else t(n,m) = f(m)t(n-1,m) + f(n)t(n,m-1), and f(n) = 4*n + 3.