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A067307 One-fourth of fourth column of triangle A067304. 0
7, 71, 768, 8920, 109232, 1390800, 18237952, 244701440, 3343713024, 46374830848, 651170275328, 9238908291072, 132251092529152, 1907671386263552, 27701755840561152, 404632598092447744 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

FORMULA

a(n)= A067304(n+3, 3)/4 = (A067297(n+3)-(b(n+3)+b(n+2)+4*b(n+1)))/4, n>=0, with b(n) := A064340(n).

G.f.: 4(3+10*c(4*x)+12*c(4*x)^2+3*c(4*x)^3)*(c(4*x)^3)/(1+c(4*x))^4, with c(x) g.f. of A000108 (Catalan).

CROSSREFS

Sequence in context: A100895 A065537 A048552 * A052390 A002119 A146752

Adjacent sequences:  A067304 A067305 A067306 * A067308 A067309 A067310

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Feb 5 2002

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.