Number of 7X7X7 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.

A166215

Number of 7X7X7 triangular nonnegative integer arrays, symmetric under 120 degree rotation, with all sums of an element and its neighbors <= n.

Terms

    a(0) =1a(1) =13a(2) =90a(3) =553a(4) =2376a(5) =8064a(6) =25771a(7) =70603a(8) =172012a(9) =405175a(10) =875990a(11) =1765534a(12) =3484228a(13) =6508702a(14) =11604117a(15) =20390870a(16) =34490146a(17) =56425254a(18) =91343551a(19) =143775379a(20) =220716013a(21) =336122564a(22) =500966646a(23) =732267501a(24) =1063633842a(25) =1518831488

External references