cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-3 of 3 results.

A063399 Main diagonal of arrays A063180 and A063181.

Original entry on oeis.org

1, 1, 7, 115, 3205, 138345, 8543519, 714313647, 77657039081, 10644520988729, 1795436642957911, 365404877299993475, 88285106031863804877, 24979640229199673829201, 8181329846390271384540511, 3070780080199883964109428031, 1309389328134899673857450461905
Offset: 1

Views

Author

Floor van Lamoen, Jul 16 2001

Keywords

Extensions

Offset corrected and more terms from Sean A. Irvine, Apr 23 2023

A063179 Di-Boustrophedon transform of (1,0,0,0,...): Fill in an array by diagonals alternating in the 'up' and 'down' directions. The n-th diagonal starts with the n-th element of (1,0,0,0,...). When going in the 'up' direction the next element is the sum of the previous element of the diagonal and the previous two elements of the row the new element is in. When going in the 'down' direction the next element is the sum of the previous element of the diagonal and the previous two elements of the column the new element is in. The final element of the n-th diagonal is a(n).

Original entry on oeis.org

1, 1, 2, 4, 12, 42, 178, 870, 4830, 29976, 205572, 1543210, 12583242, 110725638, 1045664646, 10547679660, 113172039256, 1286925785286, 15459448549274, 195616259182162, 2600506074185090, 36235386548738016, 528084808585261568, 8033872923106040478
Offset: 1

Views

Author

Floor van Lamoen, Jul 09 2001

Keywords

Examples

			Array begins:
   1  1  0  4  0 42 ...
   0  1  3  4 38 ...
   2  2  7 31 ...
   0 10 22 ...
  12 12 ...
   0 ...

Crossrefs

Cf. A000667, A059216, A062704, A063180, A063181.

Extensions

More terms from Sean A. Irvine, Apr 21 2023

A063181 The array of A063179 read by diagonals in the 'up' direction.

Original entry on oeis.org

1, 0, 1, 2, 1, 0, 0, 2, 3, 4, 12, 10, 7, 4, 0, 0, 12, 22, 31, 38, 42, 178, 166, 144, 115, 80, 42, 0, 0, 178, 344, 500, 637, 748, 828, 870, 4830, 4652, 4308, 3820, 3205, 2488, 1698, 870, 0, 0, 4830, 9482, 13968, 18132
Offset: 1

Views

Author

Floor van Lamoen, Jul 09 2001

Keywords

Crossrefs

Cf. A063179, A063180.
Showing 1-3 of 3 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.