A065086 Number of n-digit biquanimous numbers in base 10 not allowing leading zeros.

1, 9, 126, 1920, 27190, 347168, 3990467, 42744527, 440764556, 4464045276, 44863859589, 449488519847, 4498059105204, 44992451829730, 449969622539954, 4499873022468708, 44999449703306768, 449997540235466340, 4499988731927483569, 44999947410278947807

Offset: 1

Author

David W. Wilson, Nov 07 2001

Keywords

• nonn
• base

Comments

A biquanimous number (A064544) is a number whose digits can be split into two groups with equal sums.

Examples

			a(1) = 1 since 0 is the only 1-digit biquam. a(2) = 9 because there are 9 2-digit biquams, namely 11, 22, 33, 44, 55, 66, 77, 88 and 99.
		

References

• William P. Thurston, personal communication.

Crossrefs

Cf. A064544, A065023, A065025, A065024.