OFFSET
1,2
COMMENTS
Sequence is a permutation of the natural numbers.
Is this array the same as the dispersion A191668?
FORMULA
T(n,k) = A(n-k+1,k) = (8 + (3*floor((4*(n-k+1) + 1)/3) - 2)*4^k)/12, n >= k >=1.
EXAMPLE
Array A begins:
. 1 2 6 22 86 342 1366 5462 21846 87382
. 3 10 38 150 598 2390 9558 38230 152918 611670
. 4 14 54 214 854 3414 13654 54614 218454 873814
. 5 18 70 278 1110 4438 17750 70998 283990 1135958
. 7 26 102 406 1622 6486 25942 103766 415062 1660246
. 8 30 118 470 1878 7510 30038 120150 480598 1922390
. 9 34 134 534 2134 8534 34134 136534 546134 2184534
. 11 42 166 662 2646 10582 42326 169302 677206 2708822
. 12 46 182 726 2902 11606 46422 185686 742742 2970966
. 13 50 198 790 3158 12630 50518 202070 808278 3233110
...
The triangle T(n, k) begins:
n\k 1 2 3 4 5 6 7 8 9 10 ...
1: 1
2: 3 2
3: 4 10 6
4: 5 14 38 22
5: 7 18 54 150 86
6: 8 26 70 214 598 342
7: 9 30 102 278 854 2390 1366
8: 11 34 118 406 1110 3414 9558 5462
9: 12 42 134 470 1622 4438 13654 38230 21846
10:13 46 166 534 1878 6486 17750 54614 152918 87382
... Triangle formatted by Wolfdieter Lang, Aug 16 2015.
MATHEMATICA
(* Array: *)
Grid[Table[(8 + (3*Floor[(4*n + 1)/3] - 2)*4^k)/12, {n, 10}, {k, 10}]]
(* Array antidiagonals flattened: *)
Flatten[Table[(8 + (3*Floor[(4*(n - k) + 5)/3] - 2)*4^k)/12, {n, 10}, {k, n}]]
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
L. Edson Jeffery, Jul 29 2015
EXTENSIONS
Edited: Wolfdieter Lang, Aug 16 2015
STATUS
approved