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A034187 Not necessarily symmetric n X 4 crossword puzzle grids. 7
1, 39, 649, 7943, 86995, 910667, 9339937, 94844591, 958363411, 9659847433, 97245624749, 978360244839, 9839915415611, 98949930968385, 994959069405031, 10004090931544495, 100586881489055547, 1011348141567934109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 24*a(n-1) - 218*a(n-2) + 1009*a(n-3) - 2623*a(n-4) + 3513*a(n-5) - 142*a(n-6) - 7707*a(n-7) + 11632*a(n-8) - 4443*a(n-9) - 6736*a(n-10) + 9655*a(n-11) - 3714*a(n-12) - 1529*a(n-13) + 1550*a(n-14) - 597*a(n-15) + 1041*a(n-16) + 195*a(n-17) - 150*a(n-18) + 8*a(n-19) + a(n-20) for n > 20. - Andrew Howroyd, Oct 02 2017

CROSSREFS

Row 4 of A292357.

Column sums of A059680.

Cf. A001333, A034184, A034185, A034186, A034187.

Sequence in context: A077454 A142976 A200409 * A059609 A010955 A161652

Adjacent sequences:  A034184 A034185 A034186 * A034188 A034189 A034190

KEYWORD

nonn

AUTHOR

Erich Friedman

STATUS

approved

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Last modified April 22 22:16 EDT 2019. Contains 322378 sequences. (Running on oeis4.)