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A027113 Triangular array T given by rows: T(n,0)=1 for n >= 0, T(n,1)=1,T(n,2)=2 for n >= 1 and for n >= 2, T(n,k)=T(n-1,k-3)+T(n-1,k-2)+T(n-1,k-1) for 3<=k<=2n-1, T(n,2n)=T(n-1,2n-3)+T(n-1,2n-2). 31
1, 1, 1, 2, 1, 1, 2, 4, 3, 1, 1, 2, 4, 7, 9, 7, 1, 1, 2, 4, 7, 13, 20, 23, 16, 1, 1, 2, 4, 7, 13, 24, 40, 56, 59, 39, 1, 1, 2, 4, 7, 13, 24, 44, 77, 120, 155, 154, 98, 1, 1, 2, 4, 7, 13, 24, 44, 81, 145, 241, 352, 429, 407, 252, 1, 1, 2, 4, 7, 13, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

The rows are of lengths 1, 3, 5, 7, ...

LINKS

Table of n, a(n) for n=1..71.

EXAMPLE

1; 1,1,2; 1,1,2,4,3; 1,1,2,4,7,9,7; 1,1,2,4,7,13,20,23,16; ...

CROSSREFS

Sequence in context: A023504 A157905 A260931 * A096470 A085143 A253473

Adjacent sequences:  A027110 A027111 A027112 * A027114 A027115 A027116

KEYWORD

nonn,tabf

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified April 26 11:44 EDT 2017. Contains 285444 sequences.