A153918 Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 2 ones in any 5 X 5 X 5 subtriangle.

1, 2, 3, 6, 8, 13, 27, 79, 206, 623, 1643, 6478, 21771, 102958, 407720, 2191304, 10858499, 72602092, 437224300, 3520328145, 25109099300, 244666233084, 2097356566526, 24692650522065, 255493996817129, 3611171350858856

Offset

0,2

Links

Table of n, a(n) for n=0..25.

Crossrefs

Sequence in context: A318027 A004101 A003405 * A308909 A369356 A308958

Adjacent sequences: A153915 A153916 A153917 * A153919 A153920 A153921

Keyword

nonn

Author

R. H. Hardin, Jan 03 2009

Status

approved