Number of 9X9X9 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.

A166217

Number of 9X9X9 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.

Terms

    a(0) =1a(1) =34a(2) =665a(3) =8865a(4) =76249a(5) =495985a(6) =2661967a(7) =11908924a(8) =46316901a(9) =161588843a(10) =510043341a(11) =1480441810a(12) =4011008946a(13) =10193915255a(14) =24508598458a(15) =56179164262a(16) =123191992504a(17) =259647495716a(18) =528503830704

External references