A146988 - cp's OEIS frontend

A146988 Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 4^(n-1) * binomial(n-2, k-1) otherwise.

n	a(n)
0	1
1	1
2	1
3	1
4	6
5	1
6	1
7	19
8	19
9	1
10	1
11	68
12	134
13	68
14	1
15	1
16	261
17	778
18	778
19	261
20	1
21	1
22	1030
23	4111
24	6164
25	4111
26	1030
27	1
28	1
29	4103
30	20501
31	40995
32	40995
33	20501
34	4103
35	1
36	1
37	16392
38	98332
39	245816
40	327750
41	245816
42	98332
43	16392
44	1
45	1
46	65545
47	458788
48	1376340
49	2293886
50	2293886
51	1376340
52	458788
53	65545
54	1

[1, 1, 1, 1, 6, 1, 1, 19, 19, 1, 1, 68, 134, 68, 1, 1, 261, 778, 778, 261, 1, 1, 1030, 4111, 6164, 4111, 1030, 1, 1, 4103, 20501, 40995, 40995, 20501, 4103, 1, 1, 16392, 98332, 245816, 327750, 245816, 98332, 16392, 1, 1, 65545, 458788, 1376340, 2293886, 2293886, 1376340, 458788, 65545, 1]

cp's OEIS Frontend

A146988 Triangle, read by rows, T(n, k) = binomial(n, k) for n < 2 and binomial(n, k) + 4^(n-1) * binomial(n-2, k-1) otherwise.

Table of values

List of values