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A174028 Triangle T(n,k) = 2+4k read by rows. 1
2, 2, 6, 2, 6, 10, 2, 6, 10, 14, 2, 6, 10, 14, 18, 2, 6, 10, 14, 18, 22, 2, 6, 10, 14, 18, 22, 26, 2, 6, 10, 14, 18, 22, 26, 30, 2, 6, 10, 14, 18, 22, 26, 30, 34, 2, 6, 10, 14, 18, 22, 26, 30, 34, 38 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..54.

Wikipedia, Electron shell

FORMULA

T(n,k) = A016825(k).

T(n,k) = 2*A158405(n+1,k).

EXAMPLE

2;

2, 6;

2, 6, 10;

2, 6, 10, 14;

2, 6, 10, 14, 18;

2, 6, 10, 14, 18, 22;

2, 6, 10, 14, 18, 22, 26;

CROSSREFS

Cf. A001105 (row sums), A167268.

Sequence in context: A239074 A160122 A093656 * A084426 A255049 A187564

Adjacent sequences:  A174025 A174026 A174027 * A174029 A174030 A174031

KEYWORD

nonn,easy,tabl

AUTHOR

Paul Curtz, Mar 06 2010

STATUS

approved

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Last modified December 10 04:15 EST 2019. Contains 329885 sequences. (Running on oeis4.)