A174028 - OEIS

A174028

Triangle T(n,k) = 2+4k read by rows.

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

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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, 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: A160122 A093656 A338616 * A084426 A255049 A187564

Adjacent sequences: A174025 A174026 A174027 * A174029 A174030 A174031

KEYWORD

nonn,easy,tabl

AUTHOR

Paul Curtz, Mar 06 2010

STATUS

approved