Number of 3X3X3 triangular 0..n arrays with some element plus some adjacent element totalling n+1 or n-1 exactly once.

A270608

Number of 3X3X3 triangular 0..n arrays with some element plus some adjacent element totalling n+1 or n-1 exactly once.

Terms

    a(0) =0a(1) =0a(2) =312a(3) =1716a(4) =8148a(5) =23448a(6) =67788a(7) =144252a(8) =315936a(9) =568032a(10) =1049532a(11) =1692228a(12) =2793240a(13) =4176936a(14) =6369012a(15) =9014028a(16) =12965136a(17) =17596272a(18) =24205356a(19) =31786452a(20) =42217992a(21) =53986488a(22) =69705060a(23) =87206556a(24) =110011392a(25) =135134208a(26) =167193756

External references