A169951 Triangle read by rows: A169950 with rows reversed.

1, 1, 1, 1, 2, 1, 1, 1, 5, 1, 1, 2, 4, 8, 1, 1, 1, 8, 8, 13, 1, 1, 2, 7, 18, 15, 20, 1, 1, 1, 11, 13, 45, 23, 33, 1, 1, 2, 10, 28, 36, 86, 44, 48, 1, 1, 1, 14, 18, 84, 70, 184, 64, 75, 1, 1, 2, 13, 36, 68, 188, 166, 332, 117, 100, 1, 1, 1, 17, 23, 132, 134, 482, 282, 657

Offset

0,5

Links

Table of n, a(n) for n=0..74.

Index entries for sequences related to carryless arithmetic

Formula

Wanted: a recurrence. Are any of A169940-A169954 related to any other entries in the OEIS?

Example

Triangle begins:
[1]
[1, 1]
[1, 2, 1]
[1, 1, 5, 1]
[1, 2, 4, 8, 1]
[1, 1, 8, 8, 13, 1]
[1, 2, 7, 18, 15, 20, 1]
[1, 1, 11, 13, 45, 23, 33, 1]
[1, 2, 10, 28, 36, 86, 44, 48, 1]
[1, 1, 14, 18, 84, 70, 184, 64, 75, 1]
[1, 2, 13, 36, 68, 188, 166, 332, 117, 100, 1]
[1, 1, 17, 23, 132, 134, 482, 282, 657, 173, 145, 1]
[1, 2, 16, 44, 109, 316, 396, 1000, 601, 1144, 262, 204, 1]
[1, 1, 20, 28, 187, 221, 924, 742, 2279, 1035, 2086, 374, 293, 1]
[1, 2, 19, 52, 159, 478, 749, 2090, 1895, 4460, 2077, 3434, 571, 396, 1]
[1, 1, 23, 33, 251, 327, 1561, 1469, 5403, 3463, 9441, 3397, 6047, 791, 559, 1]
...

Crossrefs

Related to thickness: A169940-A169954, A061909.

Sequence in context: A290771 A014651 A275422 * A174453 A361781 A082063

Adjacent sequences: A169948 A169949 A169950 * A169952 A169953 A169954

Keyword

nonn,tabl

Author

_N. J. A. Sloane_, Aug 01 2010

Status

approved