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A155083 A directed animal related triangle. 1
1, 1, 1, 2, 3, 1, 5, 9, 6, 1, 13, 29, 25, 10, 1, 35, 92, 100, 55, 15, 1, 96, 291, 377, 266, 105, 21, 1, 267, 915, 1375, 1169, 602, 182, 28, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

First column is A005773. Row sums are A129775.

LINKS

Table of n, a(n) for n=0..35.

FORMULA

G.f.: 1/(1-xy-x/(1-x-xy-x^2/(1-x-xy-x^2/(1-x-xy-x^2/(1-...))))) (continued fraction).

EXAMPLE

Triangle begins

1,

1, 1,

2, 3, 1,

5, 9, 6, 1,

13, 29, 25, 10, 1,

35, 92, 100, 55, 15, 1,

96, 291, 377, 266, 105, 21, 1,

267, 915, 1375, 1169, 602, 182, 28, 1

CROSSREFS

Sequence in context: A147747 A039599 A154380 * A011357 A080409 A255689

Adjacent sequences:  A155080 A155081 A155082 * A155084 A155085 A155086

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Jan 19 2009

STATUS

approved

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Last modified January 21 11:20 EST 2019. Contains 319354 sequences. (Running on oeis4.)