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A277046 Triangle read by rows: T(n,k) = 2^n - n + k - 1 for n >= 1, with 1 <= k <= 2n-1. 1
1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15, 16, 17, 18, 27, 28, 29, 30, 31, 32, 33, 34, 35, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 262, 503, 504, 505, 506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518, 519 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..81.

EXAMPLE

Triangle begins:

1;

2,   3,  4;

5,   6,  7,  8,  9;

12, 13, 14, 15, 16, 17, 18;

27, 28, 29, 30, 31, 32, 33, 34, 35;

58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68;

...

Written as an isosceles triangle the sequence begins:

.                      1;

.                  2,  3,  4;

.              5,  6,  7,  8,  9;

.         12, 13, 14, 15, 16, 17, 18;

.     27, 28, 29, 30, 31, 32, 33, 34, 35;

. 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68;

..

CROSSREFS

Row lengths are A005408.

Row sums give A118414.

Column 1 gives A000325, n>=1.

Middle diagonal gives A000225.

Right border gives A083706.

Cf. A118413.

Sequence in context: A009993 A190218 A055569 * A305462 A072618 A267762

Adjacent sequences:  A277043 A277044 A277045 * A277047 A277048 A277049

KEYWORD

nonn,tabf

AUTHOR

Miquel Cerda, Sep 27 2016

EXTENSIONS

Definition from Omar E. Pol, Sep 28 2016

STATUS

approved

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Last modified October 21 16:20 EDT 2019. Contains 328302 sequences. (Running on oeis4.)