A028283 - OEIS

A028283

Central elements in 4-Pascal triangle A028275 (by row).

1, 4, 10, 32, 110, 392, 1428, 5280, 19734, 74360, 281996, 1074944, 4115020, 15808912, 60917800, 235350720, 911315430, 3535767000, 13742347740, 53495534400, 208537056420, 813950932080, 3180614712600, 12441628655040

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

Equals A000984, [1, 2, 6, 20, 70, ...] convolved with [1, 2, 0, 0, 0, ...]. - Gary W. Adamson, Jun 05 2009

LINKS

Table of n, a(n) for n=0..23.

FORMULA

a(n) = 2*A051960(n-1).

a(n) = 2*A000108(n)*(3n-1). - Ralf Stephan, Aug 24 2003

CROSSREFS

Cf. A000108, A028275, A051960.

Sequence in context: A303832 A316103 A137954 * A196991 A151746 A110145

Adjacent sequences: A028280 A028281 A028282 * A028284 A028285 A028286

KEYWORD

nonn,easy

AUTHOR

Mohammad K. Azarian

STATUS

approved