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A074147 (2n-1) odd numbers followed by 2n even numbers. 12
1, 2, 4, 3, 5, 7, 6, 8, 10, 12, 9, 11, 13, 15, 17, 14, 16, 18, 20, 22, 24, 19, 21, 23, 25, 27, 29, 31, 26, 28, 30, 32, 34, 36, 38, 40, 33, 35, 37, 39, 41, 43, 45, 47, 49, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 62, 64, 66, 68, 70, 72 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Ivan Neretin, Table of n, a(n) for n = 1..5050

FORMULA

T(n,k) = A061925(n+1)+2k, 0<=k<n. - R. J. Mathar, Jul 17 2007

a(n) = A116941(n-1)+1. - Robert G. Wilson v, Mar 09 2017

EXAMPLE

As a triangular array:

1,

2, 4,

3, 5, 7,

6, 8, 10, 12,

9, 11, 13, 15, 17,

14, 16, 18, 20, 22, 24,

...

MATHEMATICA

Flatten@Table[Ceiling[(n - 1)^2/2] + 2 k - 1, {n, 12}, {k, n}] (* Ivan Neretin, Dec 15 2016 *)

CROSSREFS

Cf. A074148, A074149, A001614.

Sequence in context: A262478 A236348 A143097 * A138607 A166014 A199779

Adjacent sequences:  A074144 A074145 A074146 * A074148 A074149 A074150

KEYWORD

nonn,tabl

AUTHOR

Amarnath Murthy, Aug 28 2002

EXTENSIONS

More terms from R. J. Mathar, Jul 17 2007

STATUS

approved

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Last modified September 20 16:31 EDT 2020. Contains 337265 sequences. (Running on oeis4.)