A377460 Numbers that cannot be generated from the box stacking described below.

11, 31, 49, 62, 73, 82, 83, 85, 92, 119, 125, 139, 145, 151, 157, 167, 173, 179, 199, 221, 223, 238, 245, 247, 250, 251, 255, 257, 262, 263, 265, 278, 284, 295, 328, 332, 359, 389, 406, 413, 433, 445, 461, 467, 471, 487, 491, 494, 509, 515, 523, 530, 533, 539, 551, 556, 557, 590

Offset

1,1

Comments

Boxes on the bottom row are labeled 1.

Boxes not on the bottom row must be supported directly below, and are labeled as the sum of the 2 or 3 boxes they are directly above, including diagonally.

Powers of 2 and powers of 3 are not in this list.

Links

Table of n, a(n) for n=1..58.

Example

The first 9 numbers can be generated like this:
1  2    3   4   5     6     7    8      9
   11  111  22  23    33   232  233    333
            11  111  1111  111  1111  11111

Crossrefs

Cf. A000079, A000244.

Sequence in context: A043124 A043904 A152293 * A031287 A230329 A232764

Adjacent sequences: A377456 A377457 A377458 * A377462 A377463 A377464

Keyword

nonn

Author

Erich Friedman, Oct 29 2024

Extensions

a(38)-a(54) from Alois P. Heinz, Oct 30 2024

Status

approved