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A027248 a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026780. 0
1, 6, 29, 156, 741, 3958, 19233, 103340, 513829, 2782642, 14111035, 76987001, 396866211, 2179190558, 11387537287, 62869497136, 332264796115, 1842788400972, 9831563838105, 54737178645869, 294362713929617, 1644215891925732, 8902034364734719, 49863044050919951 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

CROSSREFS

Sequence in context: A108982 A059724 A000708 * A192481 A020090 A020036

Adjacent sequences:  A027245 A027246 A027247 * A027249 A027250 A027251

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

More terms from Sean A. Irvine, Oct 26 2019

STATUS

approved

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Last modified February 26 13:59 EST 2021. Contains 341632 sequences. (Running on oeis4.)