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A026153 T(n,n-2), where T is the array in A026148. 0
1, 2, 7, 20, 60, 176, 517, 1512, 4415, 12870, 37477, 109044, 317109, 921870, 2679510, 7787904, 22636503, 65804638, 191332945, 556456060, 1618813834, 4710869108, 13713658368, 39935698400, 116340344575, 339050396646, 988474306017 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

CROSSREFS

First differences of A026327.

Sequence in context: A007460 A034899 A026124 * A025180 A201967 A116950

Adjacent sequences:  A026150 A026151 A026152 * A026154 A026155 A026156

KEYWORD

nonn

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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