A136534 A001263 * A128064 (unsigned).

1, 2, 2, 4, 8, 3, 7, 24, 21, 4, 11, 60, 90, 44, 5, 16, 130, 300, 260, 80, 6, 22, 2252, 840, 1120, 630, 132, 7, 29, 448, 2058, 3920, 3430, 1344, 203, 8, 37, 744, 4536, 11760, 14700, 9072, 2604, 296, 9, 46, 1170, 9180, 31248, 52920, 46872, 21420, 4680, 414, 10

Offset

1,2

Comments

Row sums = A001791: (1, 4, 15, 56, 210, ...).

Left column = A000124: (1, 2, 4, 7, 11, 16, 22, ...).

Links

Table of n, a(n) for n=1..55.

Formula

A001263 * A128064 (unsigned), A001263 = the Narayana triangle, A128064 = an infinite lower triangular matrix with (1, 2, 3, ...) in the main and subdiagonals.

Example

First few rows of the triangle:
   1;
   2,   2;
   4,   8,   3;
   7,  24,  21,    4;
  11,  60,  90,   44,   5;
  16, 130, 300,  260,  80,   6;
  22, 252, 840, 1120, 630, 132, 7;
  ...

Crossrefs

Cf. A001263, A128064, A001791, A000124.

Sequence in context: A112059 A093094 A045777 * A121175 A368515 A366714

Adjacent sequences: A136531 A136532 A136533 * A136535 A136536 A136537

Keyword

nonn,tabl

Author

Gary W. Adamson, Jan 04 2008

Status

approved