A305606 Number of blunt polytans (polyaboloes) with n cells, identifying mirror images. A blunt polytan is one with no acute corners.

0, 1, 0, 2, 2, 5, 6, 23, 45, 138, 347, 1007, 2751, 7998, 22638, 65708, 189505, 551798, 1606383, 4697905

Offset: 1

Author

George Sicherman, Jun 05 2018

Keywords

• nonn
• hard
• more

Examples

			There are 3 ditans.  Only the square ditan lacks acute corners, so a(2)=1.
		

Links

• George Sicherman, Catalogue of Blunt Polytans

Crossrefs

Cf. A006074, number of polyaboloes with n cells, identifying mirror images.

Extensions

a(15)-a(20) from John Mason, Jan 07 2022