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A106242
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Same triangle as A106243, but with rows read in boustrophedon manner, i.e. in the order in which they were created.
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3
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1, 0, 1, 0, 1, 1, 0, 2, 3, 3, 0, 6, 11, 13, 13, 0, 26, 50, 67, 73, 73, 0, 146, 286, 403, 479, 505, 505, 0, 1010, 1994, 2876, 3565, 3997, 4143, 4143, 0, 8286, 16426, 23988, 30429, 35299, 38303, 39313, 39313, 0, 78626, 156242, 229844, 295572, 349989, 390403, 415115, 423401, 423401
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,8
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LINKS
| Alois P. Heinz, Table of n, a(n) for n = 0..10010
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MAPLE
| T:= proc(n, k) option remember;
local t;
if n<1 or k<1 then 0
elif n=1 and k=1 then 1
elif n=1 and irem(k, 2)=1 or k=1 and irem(n, 2)=0 then 0
else t:= 1-2*irem(n+k, 2);
T(n-t, k+t) + T(n, k-1)+T(n-1, k)
fi
end:
seq (`if` (irem(d, 2)=1,
seq (T(d-k, k), k=1..d-1),
seq (T(n, d-n), n=1..d-1)), d=2..11); # Alois P. Heinz, Feb 08 2011
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CROSSREFS
| Right-hand diagonal is A059294. Cf. A106243. Row sums give A106327.
Sequence in context: A104172 A091408 A193382 * A121474 A138003 A057682
Adjacent sequences: A106239 A106240 A106241 * A106243 A106244 A106245
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KEYWORD
| nonn,tabl,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), May 29 2005
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EXTENSIONS
| More terms and Maple program by Alois P. Heinz (heinz(AT)hs-heilbronn.de), Feb 08 2011
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