A064641 - cp's OEIS frontend

A064641 Unidirectional 'Delannoy' variation of the Boustrophedon transform applied to all 1's sequence: construct an array in which the first element of each row is 1 and subsequent entries are given by T(n,k) = T(n,k-1) + T(n-1,k-1) + T(n-1,k) + T(n-2,k-1). The last number in row n gives a(n).

n	a(n)
0	1
1	2
2	7
3	29
4	133
5	650
6	3319
7	17498
8	94525
9	520508
10	2910895
11	16487795
12	94393105
13	545337200
14	3175320607
15	18615098837
16	109783526821
17	650884962908
18	3877184797783
19	23193307022861
20	139271612505361
21	839192166392276
22	5072534905324615
23	30749397292689194

[1, 2, 7, 29, 133, 650, 3319, 17498, 94525, 520508, 2910895, 16487795, 94393105, 545337200, 3175320607, 18615098837, 109783526821, 650884962908, 3877184797783, 23193307022861, 139271612505361, 839192166392276, 5072534905324615, 30749397292689194]

cp's OEIS Frontend

A064641 Unidirectional 'Delannoy' variation of the Boustrophedon transform applied to all 1's sequence: construct an array in which the first element of each row is 1 and subsequent entries are given by T(n,k) = T(n,k-1) + T(n-1,k-1) + T(n-1,k) + T(n-2,k-1). The last number in row n gives a(n).

Table of values

List of values