

A074147


(2n1) odd numbers followed by 2n even numbers.


13



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
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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(n1)+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 A357527
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



