A026899 T(2n+1,n+2), T given by A026780.

1, 6, 30, 144, 687, 3296, 15972, 78294, 388320, 1947910, 9875566, 50560246, 261177401, 1360112590, 7134802722, 37673830960, 200106632766, 1068539351340, 5733226876876, 30894846668416, 167137498306038, 907416216735816

Offset

1,2

Links

Table of n, a(n) for n=1..22.

Crossrefs

Sequence in context: A082134 A030192 A026376 * A135160 A276022 A046945

Adjacent sequences: A026896 A026897 A026898 * A026900 A026901 A026902

Keyword

nonn

Author

Clark Kimberling

Status

approved