A154075 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 9.

1650, 6592, 10881, 16801, 14513, 14220, 11083, 6900, 3475, 1606, 588, 460, 253, 244, 241, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240, 240, 240, 300, 240, 240

Offset

5,1

Comments

Pattern 240 300 240 240 240 starts at n=20 and continues through at least n=53.

Links

Table of n, a(n) for n=5..53.

Crossrefs

Sequence in context: A253030 A252684 A203864 * A251897 A251905 A251898

Adjacent sequences: A154072 A154073 A154074 * A154076 A154077 A154078

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved