A108074 Triangle in A071944 with rows reversed.

1, 1, 1, 2, 2, 1, 6, 5, 3, 1, 19, 16, 9, 4, 1, 63, 54, 31, 14, 5, 1, 219, 188, 111, 52, 20, 6, 1, 787, 676, 405, 197, 80, 27, 7, 1, 2897, 2492, 1508, 752, 320, 116, 35, 8, 1, 10869, 9361, 5712, 2900, 1276, 489, 161, 44, 9, 1, 41414, 35702, 21933, 11296, 5095, 2034, 714

Offset

0,4

Comments

A convolution triangle of numbers based on A071969. - Philippe Deléham, Sep 15 2005

Links

Table of n, a(n) for n=0..61.

Formula

T(0, 0) = 1; T(n, k) = 0 if k<0 or if k>n; T(n, k) = Sum_{j>=0} T(n-1, k-1+j) + Sum_{j>=0} T(n-1, k+2+j). - Philippe Deléham, Sep 15 2005

Example

Triangle begins:
   1;
   1,  1;
   2,  2,  1;
   6,  5,  3,  1;
  19, 16,  9,  4,  1; ...

Crossrefs

Cf. A071944, A071969.

Sequence in context: A106381 A064784 A174302 * A189175 A271776 A171486

Adjacent sequences: A108071 A108072 A108073 * A108075 A108076 A108077

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane, Jun 05 2005

Extensions

More terms from Philippe Deléham, Sep 15 2005

Status

approved