A202175 Array read by antidiagonals of spreading numbers alpha_n(k).

1, 1, 1, 1, 2, 1, 1, 2, 3, 1, 1, 3, 4, 4, 1, 1, 3, 6, 5, 5, 1, 1, 4, 7, 11, 7, 6, 1, 1, 4, 10, 14, 16, 10, 7, 1, 1, 5, 12, 24

Offset

1,5

Links

Table of n, a(n) for n=1..40.

B. Babcock and A. van Tuyl, Revisiting the spreading and covering numbers, arXiv preprint arXiv:1109.5847, 2011

Example

Array begins:
1 1 1 1 1 1 1 1 1 1 ...
1 2 2 3 3 4 4 5 5 6 ...
1 3 4 6 7 10 12 15 19 22 ...
1 4 5 11 14 24 30 45 55 76 ...
1 5 7 16 [26-33] ...
...

Crossrefs

Row 3 is A202169, row 4 is A053307. Cf. A202176.

Sequence in context: A308203 A275416 A037161 * A202176 A168443 A156041

Adjacent sequences: A202172 A202173 A202174 * A202176 A202177 A202178

Keyword

nonn,tabl

Author

N. J. A. Sloane, Dec 13 2011

Status

approved