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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 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.)